os0file.c
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上传日期:2007-04-14
资源大小:10674k
文件大小:46k
- /******************************************************
- The interface to the operating system file i/o primitives
- (c) 1995 Innobase Oy
- Created 10/21/1995 Heikki Tuuri
- *******************************************************/
- #include "os0file.h"
- #include "os0sync.h"
- #include "ut0mem.h"
- #ifdef POSIX_ASYNC_IO
- /* We assume in this case that the OS has standard Posix aio (at least SunOS
- 2.6, HP-UX 11i and AIX 4.3 have) */
- #undef __USE_FILE_OFFSET64
- #include <aio.h>
- #endif
- /* We use these mutexes to protect lseek + file i/o operation, if the
- OS does not provide an atomic pread or pwrite, or similar */
- #define OS_FILE_N_SEEK_MUTEXES 16
- os_mutex_t os_file_seek_mutexes[OS_FILE_N_SEEK_MUTEXES];
- /* In simulated aio, merge at most this many consecutive i/os */
- #define OS_AIO_MERGE_N_CONSECUTIVE 32
- /* If this flag is TRUE, then we will use the native aio of the
- OS (provided we compiled Innobase with it in), otherwise we will
- use simulated aio we build below with threads */
- ibool os_aio_use_native_aio = FALSE;
- /* The aio array slot structure */
- typedef struct os_aio_slot_struct os_aio_slot_t;
- struct os_aio_slot_struct{
- ibool is_read; /* TRUE if a read operation */
- ulint pos; /* index of the slot in the aio
- array */
- ibool reserved; /* TRUE if this slot is reserved */
- ulint len; /* length of the block to read or
- write */
- byte* buf; /* buffer used in i/o */
- ulint type; /* OS_FILE_READ or OS_FILE_WRITE */
- ulint offset; /* 32 low bits of file offset in
- bytes */
- ulint offset_high; /* 32 high bits of file offset */
- os_file_t file; /* file where to read or write */
- char* name; /* file name or path */
- ibool io_already_done;/* used only in simulated aio:
- TRUE if the physical i/o already
- made and only the slot message
- needs to be passed to the caller
- of os_aio_simulated_handle */
- void* message1; /* message which is given by the */
- void* message2; /* the requester of an aio operation
- and which can be used to identify
- which pending aio operation was
- completed */
- #ifdef WIN_ASYNC_IO
- OVERLAPPED control; /* Windows control block for the
- aio request */
- #elif defined(POSIX_ASYNC_IO)
- struct aiocb control; /* Posix control block for aio
- request */
- #endif
- };
- /* The aio array structure */
- typedef struct os_aio_array_struct os_aio_array_t;
- struct os_aio_array_struct{
- os_mutex_t mutex; /* the mutex protecting the aio array */
- os_event_t not_full; /* The event which is set to signaled
- state when there is space in the aio
- outside the ibuf segment */
- ulint n_slots; /* Total number of slots in the aio array.
- This must be divisible by n_threads. */
- ulint n_segments;/* Number of segments in the aio array of
- pending aio requests. A thread can wait
- separately for any one of the segments. */
- ulint n_reserved;/* Number of reserved slots in the
- aio array outside the ibuf segment */
- os_aio_slot_t* slots; /* Pointer to the slots in the array */
- os_event_t* events; /* Pointer to an array of event handles
- where we copied the handles from slots,
- in the same order. This can be used in
- WaitForMultipleObjects; used only in
- Windows */
- };
- /* Array of events used in simulated aio */
- os_event_t* os_aio_segment_wait_events = NULL;
- /* The aio arrays for non-ibuf i/o and ibuf i/o, as well as sync aio. These
- are NULL when the module has not yet been initialized. */
- os_aio_array_t* os_aio_read_array = NULL;
- os_aio_array_t* os_aio_write_array = NULL;
- os_aio_array_t* os_aio_ibuf_array = NULL;
- os_aio_array_t* os_aio_log_array = NULL;
- os_aio_array_t* os_aio_sync_array = NULL;
- ulint os_aio_n_segments = ULINT_UNDEFINED;
- /***************************************************************************
- Retrieves the last error number if an error occurs in a file io function.
- The number should be retrieved before any other OS calls (because they may
- overwrite the error number). If the number is not known to this program,
- the OS error number + 100 is returned. */
- ulint
- os_file_get_last_error(void)
- /*========================*/
- /* out: error number, or OS error number + 100 */
- {
- ulint err;
- #ifdef __WIN__
- err = (ulint) GetLastError();
- if (err == ERROR_FILE_NOT_FOUND) {
- return(OS_FILE_NOT_FOUND);
- } else if (err == ERROR_DISK_FULL) {
- return(OS_FILE_DISK_FULL);
- } else if (err == ERROR_FILE_EXISTS) {
- return(OS_FILE_ALREADY_EXISTS);
- } else {
- return(100 + err);
- }
- #else
- err = (ulint) errno;
- if (err == ENOSPC ) {
- return(OS_FILE_DISK_FULL);
- #ifdef POSIX_ASYNC_IO
- } else if (err == EAGAIN) {
- return(OS_FILE_AIO_RESOURCES_RESERVED);
- #endif
- } else if (err == ENOENT) {
- return(OS_FILE_NOT_FOUND);
- } else if (err == EEXIST) {
- return(OS_FILE_ALREADY_EXISTS);
- } else {
- return(100 + err);
- }
- #endif
- }
- /********************************************************************
- Does error handling when a file operation fails. If we have run out
- of disk space, then the user can clean the disk. If we do not find
- a specified file, then the user can copy it to disk. */
- static
- ibool
- os_file_handle_error(
- /*=================*/
- /* out: TRUE if we should retry the operation */
- os_file_t file, /* in: file pointer */
- char* name) /* in: name of a file or NULL */
- {
- int input_char;
- ulint err;
- UT_NOT_USED(file);
- err = os_file_get_last_error();
-
- if (err == OS_FILE_DISK_FULL) {
- ask_again:
- printf("n");
- if (name) {
- printf(
- "Innobase encountered a problem with file %s.n",
- name);
- }
- printf("Disk is full. Try to clean the disk to free spacen");
- printf("before answering the following: How to continue?n");
- printf("(Y == freed some space: try again)n");
- printf("(N == crash the database: will restart it)?n");
- ask_with_no_question:
- input_char = getchar();
- if (input_char == (int) 'N') {
- ut_error;
-
- return(FALSE);
- } else if (input_char == (int) 'Y') {
- return(TRUE);
- } else if (input_char == (int) 'n') {
- goto ask_with_no_question;
- } else {
- goto ask_again;
- }
- } else if (err == OS_FILE_AIO_RESOURCES_RESERVED) {
- return(TRUE);
- } else {
- ut_error;
- }
- return(FALSE);
- }
- /********************************************************************
- Opens an existing file or creates a new. */
- os_file_t
- os_file_create(
- /*===========*/
- /* out, own: handle to the file, not defined if error,
- error number can be retrieved with os_get_last_error */
- char* name, /* in: name of the file or path as a null-terminated
- string */
- ulint create_mode, /* in: OS_FILE_OPEN if an existing file is opened
- (if does not exist, error), or OS_FILE_CREATE if a new
- file is created (if exists, error), OS_FILE_OVERWRITE
- if a new is created or an old overwritten */
- ulint purpose,/* in: OS_FILE_AIO, if asynchronous, non-buffered i/o
- is desired, OS_FILE_NORMAL, if any normal file */
- ibool* success)/* out: TRUE if succeed, FALSE if error */
- {
- #ifdef __WIN__
- os_file_t file;
- DWORD create_flag;
- DWORD attributes;
- ibool retry;
-
- try_again:
- ut_a(name);
- if (create_mode == OS_FILE_OPEN) {
- create_flag = OPEN_EXISTING;
- } else if (create_mode == OS_FILE_CREATE) {
- create_flag = CREATE_NEW;
- } else if (create_mode == OS_FILE_OVERWRITE) {
- create_flag = CREATE_ALWAYS;
- } else {
- create_flag = 0;
- ut_error;
- }
- if (purpose == OS_FILE_AIO) {
- /* use asynchronous (overlapped) io and no buffering
- of writes in the OS */
- attributes = 0;
- #ifdef WIN_ASYNC_IO
- if (os_aio_use_native_aio) {
- attributes = attributes | FILE_FLAG_OVERLAPPED;
- }
- #endif
- #ifdef UNIV_NON_BUFFERED_IO
- attributes = attributes | FILE_FLAG_NO_BUFFERING;
- #endif
- } else if (purpose == OS_FILE_NORMAL) {
- attributes = 0
- #ifdef UNIV_NON_BUFFERED_IO
- | FILE_FLAG_NO_BUFFERING
- #endif
- ;
- } else {
- attributes = 0;
- ut_error;
- }
- file = CreateFile(name,
- GENERIC_READ | GENERIC_WRITE, /* read and write
- access */
- FILE_SHARE_READ,/* file can be read by other
- processes */
- NULL, /* default security attributes */
- create_flag,
- attributes,
- NULL); /* no template file */
- if (file == INVALID_HANDLE_VALUE) {
- *success = FALSE;
- if (create_mode != OS_FILE_OPEN
- && os_file_get_last_error() == OS_FILE_DISK_FULL) {
- retry = os_file_handle_error(file, name);
- if (retry) {
- goto try_again;
- }
- }
- } else {
- *success = TRUE;
- }
- return(file);
- #else
- os_file_t file;
- int create_flag;
- ibool retry;
-
- try_again:
- ut_a(name);
- if (create_mode == OS_FILE_OPEN) {
- create_flag = O_RDWR;
- } else if (create_mode == OS_FILE_CREATE) {
- create_flag = O_RDWR | O_CREAT | O_EXCL;
- } else if (create_mode == OS_FILE_OVERWRITE) {
- create_flag = O_RDWR | O_CREAT | O_TRUNC;
- } else {
- create_flag = 0;
- ut_error;
- }
- UT_NOT_USED(purpose);
- if (create_mode == OS_FILE_CREATE) {
- #ifndef S_IRWXU
- file = open(name, create_flag);
- #else
- file = open(name, create_flag, S_IRWXU | S_IRWXG | S_IRWXO);
- #endif
- } else {
- file = open(name, create_flag);
- }
-
- if (file == -1) {
- *success = FALSE;
- if (create_mode != OS_FILE_OPEN
- && errno == ENOSPC) {
- retry = os_file_handle_error(file, name);
- if (retry) {
- goto try_again;
- }
- }
- } else {
- *success = TRUE;
- }
- return(file);
- #endif
- }
- /***************************************************************************
- Closes a file handle. In case of error, error number can be retrieved with
- os_file_get_last_error. */
- ibool
- os_file_close(
- /*==========*/
- /* out: TRUE if success */
- os_file_t file) /* in, own: handle to a file */
- {
- #ifdef __WIN__
- BOOL ret;
- ut_a(file);
- ret = CloseHandle(file);
- if (ret) {
- return(TRUE);
- }
- return(FALSE);
- #else
- int ret;
- ret = close(file);
- if (ret == -1) {
- return(FALSE);
- }
- return(TRUE);
- #endif
- }
- /***************************************************************************
- Gets a file size. */
- ibool
- os_file_get_size(
- /*=============*/
- /* out: TRUE if success */
- os_file_t file, /* in: handle to a file */
- ulint* size, /* out: least significant 32 bits of file
- size */
- ulint* size_high)/* out: most significant 32 bits of size */
- {
- #ifdef __WIN__
- DWORD high;
- DWORD low;
- low = GetFileSize(file, &high);
- if ((low == 0xFFFFFFFF) && (GetLastError() != NO_ERROR)) {
- return(FALSE);
- }
- *size = low;
- *size_high = high;
- return(TRUE);
- #else
- *size = (ulint) lseek(file, 0, SEEK_END);
- *size_high = 0;
-
- return(TRUE);
- #endif
- }
- /***************************************************************************
- Sets a file size. This function can be used to extend or truncate a file. */
- ibool
- os_file_set_size(
- /*=============*/
- /* out: TRUE if success */
- char* name, /* in: name of the file or path as a
- null-terminated string */
- os_file_t file, /* in: handle to a file */
- ulint size, /* in: least significant 32 bits of file
- size */
- ulint size_high)/* in: most significant 32 bits of size */
- {
- ulint offset;
- ulint n_bytes;
- ulint low;
- ibool ret;
- ibool retry;
- ulint i;
- byte* buf;
- try_again:
- buf = ut_malloc(UNIV_PAGE_SIZE * 64);
- /* Write buffer full of zeros */
- for (i = 0; i < UNIV_PAGE_SIZE * 64; i++) {
- buf[i] = ' ';
- }
- offset = 0;
- low = size;
- #if (UNIV_WORD_SIZE == 8)
- low = low + (size_high << 32);
- #else
- UT_NOT_USED(size_high);
- #endif
- while (offset < low) {
- if (low - offset < UNIV_PAGE_SIZE * 64) {
- n_bytes = low - offset;
- } else {
- n_bytes = UNIV_PAGE_SIZE * 64;
- }
-
- ret = os_file_write(name, file, buf, offset, 0, n_bytes);
- if (!ret) {
- ut_free(buf);
- goto error_handling;
- }
- offset += n_bytes;
- }
- ut_free(buf);
- ret = os_file_flush(file);
- if (ret) {
- return(TRUE);
- }
- error_handling:
- retry = os_file_handle_error(file, name);
- if (retry) {
- goto try_again;
- }
-
- ut_error;
- return(FALSE);
- }
- /***************************************************************************
- Flushes the write buffers of a given file to the disk. */
- ibool
- os_file_flush(
- /*==========*/
- /* out: TRUE if success */
- os_file_t file) /* in, own: handle to a file */
- {
- #ifdef __WIN__
- BOOL ret;
- ut_a(file);
- ret = FlushFileBuffers(file);
- if (ret) {
- return(TRUE);
- }
- return(FALSE);
- #else
- int ret;
-
- ret = fsync(file);
- if (ret == 0) {
- return(TRUE);
- }
-
- return(FALSE);
- #endif
- }
- #ifndef __WIN__
- /***********************************************************************
- Does a synchronous read operation in Posix. */
- static
- ssize_t
- os_file_pread(
- /*==========*/
- /* out: number of bytes read, -1 if error */
- os_file_t file, /* in: handle to a file */
- void* buf, /* in: buffer where to read */
- ulint n, /* in: number of bytes to read */
- ulint offset) /* in: offset from where to read */
- {
- #ifdef HAVE_PREAD
- return(pread(file, buf, n, (off_t) offset));
- #else
- ssize_t ret;
- ulint i;
- /* Protect the seek / read operation with a mutex */
- i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
-
- os_mutex_enter(os_file_seek_mutexes[i]);
- ret = lseek(file, (off_t) offset, 0);
- if (ret < 0) {
- os_mutex_exit(os_file_seek_mutexes[i]);
- return(ret);
- }
-
- ret = read(file, buf, n);
- os_mutex_exit(os_file_seek_mutexes[i]);
- return(ret);
- #endif
- }
- /***********************************************************************
- Does a synchronous write operation in Posix. */
- static
- ssize_t
- os_file_pwrite(
- /*===========*/
- /* out: number of bytes written, -1 if error */
- os_file_t file, /* in: handle to a file */
- void* buf, /* in: buffer from where to write */
- ulint n, /* in: number of bytes to write */
- ulint offset) /* in: offset where to write */
- {
- #ifdef HAVE_PWRITE
- return(pwrite(file, buf, n, (off_t) offset));
- #else
- ssize_t ret;
- ulint i;
- /* Protect the seek / write operation with a mutex */
- i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
-
- os_mutex_enter(os_file_seek_mutexes[i]);
- ret = lseek(file, (off_t) offset, 0);
- if (ret < 0) {
- os_mutex_exit(os_file_seek_mutexes[i]);
- return(ret);
- }
-
- ret = write(file, buf, n);
- os_mutex_exit(os_file_seek_mutexes[i]);
- return(ret);
- #endif
- }
- #endif
- /***********************************************************************
- Requests a synchronous positioned read operation. */
- ibool
- os_file_read(
- /*=========*/
- /* out: TRUE if request was
- successful, FALSE if fail */
- os_file_t file, /* in: handle to a file */
- void* buf, /* in: buffer where to read */
- ulint offset, /* in: least significant 32 bits of file
- offset where to read */
- ulint offset_high, /* in: most significant 32 bits of
- offset */
- ulint n) /* in: number of bytes to read */
- {
- #ifdef __WIN__
- BOOL ret;
- DWORD len;
- DWORD ret2;
- DWORD err;
- DWORD low;
- DWORD high;
- ibool retry;
- ulint i;
-
- try_again:
- ut_ad(file);
- ut_ad(buf);
- ut_ad(n > 0);
- low = offset;
- high = offset_high;
- /* Protect the seek / read operation with a mutex */
- i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
-
- os_mutex_enter(os_file_seek_mutexes[i]);
- ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);
- if (ret2 == 0xFFFFFFFF && GetLastError() != NO_ERROR) {
- err = GetLastError();
- os_mutex_exit(os_file_seek_mutexes[i]);
- goto error_handling;
- }
-
- ret = ReadFile(file, buf, n, &len, NULL);
- os_mutex_exit(os_file_seek_mutexes[i]);
-
- if (ret && len == n) {
- return(TRUE);
- }
- err = GetLastError();
- #else
- ibool retry;
- ssize_t ret;
- ulint i;
-
- #if (UNIV_WORD_SIZE == 8)
- offset = offset + (offset_high << 32);
- #else
- UT_NOT_USED(offset_high);
- #endif
- try_again:
- /* Protect the seek / read operation with a mutex */
- i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
-
- os_mutex_enter(os_file_seek_mutexes[i]);
- ret = os_file_pread(file, buf, n, (off_t) offset);
- if ((ulint)ret == n) {
- os_mutex_exit(os_file_seek_mutexes[i]);
- return(TRUE);
- }
- #endif
- error_handling:
- retry = os_file_handle_error(file, NULL);
- if (retry) {
- goto try_again;
- }
-
- ut_error;
- return(FALSE);
- }
- /***********************************************************************
- Requests a synchronous write operation. */
- ibool
- os_file_write(
- /*==========*/
- /* out: TRUE if request was
- successful, FALSE if fail */
- char* name, /* in: name of the file or path as a
- null-terminated string */
- os_file_t file, /* in: handle to a file */
- void* buf, /* in: buffer from which to write */
- ulint offset, /* in: least significant 32 bits of file
- offset where to write */
- ulint offset_high, /* in: most significant 32 bits of
- offset */
- ulint n) /* in: number of bytes to write */
- {
- #ifdef __WIN__
- BOOL ret;
- DWORD len;
- DWORD ret2;
- DWORD err;
- DWORD low;
- DWORD high;
- ibool retry;
- ulint i;
- try_again:
- ut_ad(file);
- ut_ad(buf);
- ut_ad(n > 0);
- low = offset;
- high = offset_high;
-
- /* Protect the seek / write operation with a mutex */
- i = ((ulint) file) % OS_FILE_N_SEEK_MUTEXES;
-
- os_mutex_enter(os_file_seek_mutexes[i]);
- ret2 = SetFilePointer(file, low, &high, FILE_BEGIN);
- if (ret2 == 0xFFFFFFFF && GetLastError() != NO_ERROR) {
- err = GetLastError();
- os_mutex_exit(os_file_seek_mutexes[i]);
-
- goto error_handling;
- }
- ret = WriteFile(file, buf, n, &len, NULL);
- os_mutex_exit(os_file_seek_mutexes[i]);
-
- if (ret && len == n) {
- return(TRUE);
- }
- #else
- ibool retry;
- ssize_t ret;
-
- #if (UNIV_WORD_SIZE == 8)
- offset = offset + (offset_high << 32);
- #else
- UT_NOT_USED(offset_high);
- #endif
- try_again:
- ret = pwrite(file, buf, n, (off_t) offset);
- if ((ulint)ret == n) {
- return(TRUE);
- }
- #endif
- error_handling:
- retry = os_file_handle_error(file, name);
- if (retry) {
- goto try_again;
- }
-
- ut_error;
- return(FALSE);
- }
- /********************************************************************
- Returns a pointer to the nth slot in the aio array. */
- static
- os_aio_slot_t*
- os_aio_array_get_nth_slot(
- /*======================*/
- /* out: pointer to slot */
- os_aio_array_t* array, /* in: aio array */
- ulint index) /* in: index of the slot */
- {
- ut_a(index < array->n_slots);
- return((array->slots) + index);
- }
- /****************************************************************************
- Creates an aio wait array. */
- static
- os_aio_array_t*
- os_aio_array_create(
- /*================*/
- /* out, own: aio array */
- ulint n, /* in: maximum number of pending aio operations
- allowed; n must be divisible by n_segments */
- ulint n_segments) /* in: number of segments in the aio array */
- {
- os_aio_array_t* array;
- ulint i;
- os_aio_slot_t* slot;
- #ifdef WIN_ASYNC_IO
- OVERLAPPED* over;
- #endif
- ut_a(n > 0);
- ut_a(n_segments > 0);
- ut_a(n % n_segments == 0);
- array = ut_malloc(sizeof(os_aio_array_t));
- array->mutex = os_mutex_create(NULL);
- array->not_full = os_event_create(NULL);
- array->n_slots = n;
- array->n_segments = n_segments;
- array->n_reserved = 0;
- array->slots = ut_malloc(n * sizeof(os_aio_slot_t));
- array->events = ut_malloc(n * sizeof(os_event_t));
-
- for (i = 0; i < n; i++) {
- slot = os_aio_array_get_nth_slot(array, i);
- slot->pos = i;
- slot->reserved = FALSE;
- #ifdef WIN_ASYNC_IO
- over = &(slot->control);
- over->hEvent = os_event_create(NULL);
- *((array->events) + i) = over->hEvent;
- #endif
- }
-
- return(array);
- }
- /****************************************************************************
- Initializes the asynchronous io system. Creates separate aio array for
- non-ibuf read and write, a third aio array for the ibuf i/o, with just one
- segment, two aio arrays for log reads and writes with one segment, and a
- synchronous aio array of the specified size. The combined number of segments
- in the three first aio arrays is the parameter n_segments given to the
- function. The caller must create an i/o handler thread for each segment in
- the four first arrays, but not for the sync aio array. */
- void
- os_aio_init(
- /*========*/
- ulint n, /* in: maximum number of pending aio operations
- allowed; n must be divisible by n_segments */
- ulint n_segments, /* in: combined number of segments in the four
- first aio arrays; must be >= 4 */
- ulint n_slots_sync) /* in: number of slots in the sync aio array */
- {
- ulint n_read_segs;
- ulint n_write_segs;
- ulint n_per_seg;
- ulint i;
- #ifdef POSIX_ASYNC_IO
- sigset_t sigset;
- #endif
- ut_ad(n % n_segments == 0);
- ut_ad(n_segments >= 4);
- n_per_seg = n / n_segments;
- n_write_segs = (n_segments - 2) / 2;
- n_read_segs = n_segments - 2 - n_write_segs;
-
- /* printf("Array n per seg %lun", n_per_seg); */
- os_aio_read_array = os_aio_array_create(n_read_segs * n_per_seg,
- n_read_segs);
- os_aio_write_array = os_aio_array_create(n_write_segs * n_per_seg,
- n_write_segs);
- os_aio_ibuf_array = os_aio_array_create(n_per_seg, 1);
- os_aio_log_array = os_aio_array_create(n_per_seg, 1);
- os_aio_sync_array = os_aio_array_create(n_slots_sync, 1);
- os_aio_n_segments = n_segments;
- os_aio_validate();
- for (i = 0; i < OS_FILE_N_SEEK_MUTEXES; i++) {
- os_file_seek_mutexes[i] = os_mutex_create(NULL);
- }
- os_aio_segment_wait_events = ut_malloc(n_segments * sizeof(void*));
- for (i = 0; i < n_segments; i++) {
- os_aio_segment_wait_events[i] = os_event_create(NULL);
- }
- #ifdef POSIX_ASYNC_IO
- /* Block aio signals from the current thread and its children:
- for this to work, the current thread must be the first created
- in the database, so that all its children will inherit its
- signal mask */
-
- sigemptyset(&sigset);
- sigaddset(&sigset, SIGRTMIN + 1 + 0);
- sigaddset(&sigset, SIGRTMIN + 1 + 1);
- sigaddset(&sigset, SIGRTMIN + 1 + 2);
- sigaddset(&sigset, SIGRTMIN + 1 + 3);
- pthread_sigmask(SIG_BLOCK, &sigset, NULL);
- #endif
- }
-
- /**************************************************************************
- Calculates segment number for a slot. */
- static
- ulint
- os_aio_get_segment_no_from_slot(
- /*============================*/
- /* out: segment number (which is the number
- used by, for example, i/o-handler threads) */
- os_aio_array_t* array, /* in: aio wait array */
- os_aio_slot_t* slot) /* in: slot in this array */
- {
- ulint segment;
- ulint seg_len;
- if (array == os_aio_ibuf_array) {
- segment = 0;
- } else if (array == os_aio_log_array) {
- segment = 1;
-
- } else if (array == os_aio_read_array) {
- seg_len = os_aio_read_array->n_slots /
- os_aio_read_array->n_segments;
- segment = 2 + slot->pos / seg_len;
- } else {
- ut_a(array == os_aio_write_array);
- seg_len = os_aio_write_array->n_slots /
- os_aio_write_array->n_segments;
- segment = os_aio_read_array->n_segments + 2
- + slot->pos / seg_len;
- }
- return(segment);
- }
- /**************************************************************************
- Calculates local segment number and aio array from global segment number. */
- static
- ulint
- os_aio_get_array_and_local_segment(
- /*===============================*/
- /* out: local segment number within
- the aio array */
- os_aio_array_t** array, /* out: aio wait array */
- ulint global_segment)/* in: global segment number */
- {
- ulint segment;
- ut_a(global_segment < os_aio_n_segments);
- if (global_segment == 0) {
- *array = os_aio_ibuf_array;
- segment = 0;
- } else if (global_segment == 1) {
- *array = os_aio_log_array;
- segment = 0;
-
- } else if (global_segment < os_aio_read_array->n_segments + 2) {
- *array = os_aio_read_array;
- segment = global_segment - 2;
- } else {
- *array = os_aio_write_array;
- segment = global_segment - (os_aio_read_array->n_segments + 2);
- }
- return(segment);
- }
- /***********************************************************************
- Gets an integer value designating a specified aio array. This is used
- to give numbers to signals in Posix aio. */
- static
- ulint
- os_aio_get_array_no(
- /*================*/
- os_aio_array_t* array) /* in: aio array */
- {
- if (array == os_aio_ibuf_array) {
-
- return(0);
- } else if (array == os_aio_log_array) {
- return(1);
- } else if (array == os_aio_read_array) {
- return(2);
- } else if (array == os_aio_write_array) {
- return(3);
- } else {
- ut_a(0);
- return(0);
- }
- }
- /***********************************************************************
- Gets the aio array for its number. */
- static
- os_aio_array_t*
- os_aio_get_array_from_no(
- /*=====================*/
- /* out: aio array */
- ulint n) /* in: array number */
- {
- if (n == 0) {
- return(os_aio_ibuf_array);
- } else if (n == 1) {
- return(os_aio_log_array);
- } else if (n == 2) {
- return(os_aio_read_array);
- } else if (n == 3) {
- return(os_aio_write_array);
- } else {
- ut_a(0);
- return(NULL);
- }
- }
- /***********************************************************************
- Requests for a slot in the aio array. If no slot is available, waits until
- not_full-event becomes signaled. */
- static
- os_aio_slot_t*
- os_aio_array_reserve_slot(
- /*======================*/
- /* out: pointer to slot */
- ulint type, /* in: OS_FILE_READ or OS_FILE_WRITE */
- os_aio_array_t* array, /* in: aio array */
- void* message1,/* in: message to be passed along with
- the aio operation */
- void* message2,/* in: message to be passed along with
- the aio operation */
- os_file_t file, /* in: file handle */
- char* name, /* in: name of the file or path as a
- null-terminated string */
- void* buf, /* in: buffer where to read or from which
- to write */
- ulint offset, /* in: least significant 32 bits of file
- offset */
- ulint offset_high, /* in: most significant 32 bits of
- offset */
- ulint len) /* in: length of the block to read or write */
- {
- os_aio_slot_t* slot;
- #ifdef WIN_ASYNC_IO
- OVERLAPPED* control;
- #elif defined(POSIX_ASYNC_IO)
- struct aiocb* control;
- #endif
- ulint i;
- loop:
- os_mutex_enter(array->mutex);
- if (array->n_reserved == array->n_slots) {
- os_mutex_exit(array->mutex);
- if (!os_aio_use_native_aio) {
- /* If the handler threads are suspended, wake them
- so that we get more slots */
- os_aio_simulated_wake_handler_threads();
- }
-
- os_event_wait(array->not_full);
- goto loop;
- }
- for (i = 0;; i++) {
- slot = os_aio_array_get_nth_slot(array, i);
- if (slot->reserved == FALSE) {
- break;
- }
- }
- array->n_reserved++;
- if (array->n_reserved == array->n_slots) {
- os_event_reset(array->not_full);
- }
-
- slot->reserved = TRUE;
- slot->message1 = message1;
- slot->message2 = message2;
- slot->file = file;
- slot->name = name;
- slot->len = len;
- slot->type = type;
- slot->buf = buf;
- slot->offset = offset;
- slot->offset_high = offset_high;
- slot->io_already_done = FALSE;
-
- #ifdef WIN_ASYNC_IO
- control = &(slot->control);
- control->Offset = (DWORD)offset;
- control->OffsetHigh = (DWORD)offset_high;
- os_event_reset(control->hEvent);
- #elif defined(POSIX_ASYNC_IO)
- #if (UNIV_WORD_SIZE == 8)
- offset = offset + (offset_high << 32);
- #else
- ut_a(offset_high == 0);
- #endif
- control = &(slot->control);
- control->aio_fildes = file;
- control->aio_buf = buf;
- control->aio_nbytes = len;
- control->aio_offset = offset;
- control->aio_reqprio = 0;
- control->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
- control->aio_sigevent.sigev_signo =
- SIGRTMIN + 1 + os_aio_get_array_no(array);
- /* TODO: How to choose the signal numbers? */
- /*
- printf("AIO signal number %lun", (ulint) control->aio_sigevent.sigev_signo);
- */
- control->aio_sigevent.sigev_value.sival_ptr = slot;
- #endif
- os_mutex_exit(array->mutex);
- return(slot);
- }
- /***********************************************************************
- Frees a slot in the aio array. */
- static
- void
- os_aio_array_free_slot(
- /*===================*/
- os_aio_array_t* array, /* in: aio array */
- os_aio_slot_t* slot) /* in: pointer to slot */
- {
- ut_ad(array);
- ut_ad(slot);
- os_mutex_enter(array->mutex);
- ut_ad(slot->reserved);
-
- slot->reserved = FALSE;
- array->n_reserved--;
- if (array->n_reserved == array->n_slots - 1) {
- os_event_set(array->not_full);
- }
- #ifdef WIN_ASYNC_IO
- os_event_reset(slot->control.hEvent);
- #endif
- os_mutex_exit(array->mutex);
- }
- /**************************************************************************
- Wakes up a simulated aio i/o-handler thread if it has something to do. */
- static
- void
- os_aio_simulated_wake_handler_thread(
- /*=================================*/
- ulint global_segment) /* in: the number of the segment in the aio
- arrays */
- {
- os_aio_array_t* array;
- ulint segment;
- os_aio_slot_t* slot;
- ulint n;
- ulint i;
- ut_ad(!os_aio_use_native_aio);
- segment = os_aio_get_array_and_local_segment(&array, global_segment);
- n = array->n_slots / array->n_segments;
- /* Look through n slots after the segment * n'th slot */
- os_mutex_enter(array->mutex);
- for (i = 0; i < n; i++) {
- slot = os_aio_array_get_nth_slot(array, i + segment * n);
- if (slot->reserved) {
- /* Found an i/o request */
-
- break;
- }
- }
- os_mutex_exit(array->mutex);
- if (i < n) {
- os_event_set(os_aio_segment_wait_events[global_segment]);
- }
- }
- /**************************************************************************
- Wakes up simulated aio i/o-handler threads if they have something to do. */
- void
- os_aio_simulated_wake_handler_threads(void)
- /*=======================================*/
- {
- ulint i;
- if (os_aio_use_native_aio) {
- /* We do not use simulated aio: do nothing */
- return;
- }
- for (i = 0; i < os_aio_n_segments; i++) {
- os_aio_simulated_wake_handler_thread(i);
- }
- }
- /***********************************************************************
- Requests an asynchronous i/o operation. */
- ibool
- os_aio(
- /*===*/
- /* out: TRUE if request was queued
- successfully, FALSE if fail */
- ulint type, /* in: OS_FILE_READ or OS_FILE_WRITE */
- ulint mode, /* in: OS_AIO_NORMAL, ..., possibly ORed
- to OS_AIO_SIMULATED_WAKE_LATER: the
- last flag advises this function not to wake
- i/o-handler threads, but the caller will
- do the waking explicitly later, in this
- way the caller can post several requests in
- a batch; NOTE that the batch must not be
- so big that it exhausts the slots in aio
- arrays! NOTE that a simulated batch
- may introduce hidden chances of deadlocks,
- because i/os are not actually handled until
- all have been posted: use with great
- caution! */
- char* name, /* in: name of the file or path as a
- null-terminated string */
- os_file_t file, /* in: handle to a file */
- void* buf, /* in: buffer where to read or from which
- to write */
- ulint offset, /* in: least significant 32 bits of file
- offset where to read or write */
- ulint offset_high, /* in: most significant 32 bits of
- offset */
- ulint n, /* in: number of bytes to read or write */
- void* message1,/* in: messages for the aio handler (these
- can be used to identify a completed aio
- operation); if mode is OS_AIO_SYNC, these
- are ignored */
- void* message2)
- {
- os_aio_array_t* array;
- os_aio_slot_t* slot;
- #ifdef WIN_ASYNC_IO
- BOOL ret = TRUE;
- DWORD len = n;
- void* dummy_mess1;
- void* dummy_mess2;
- #endif
- ulint err = 0;
- ibool retry;
- ulint wake_later;
- ut_ad(file);
- ut_ad(buf);
- ut_ad(n > 0);
- ut_ad(n % OS_FILE_LOG_BLOCK_SIZE == 0);
- ut_ad((ulint)buf % OS_FILE_LOG_BLOCK_SIZE == 0)
- ut_ad(offset % OS_FILE_LOG_BLOCK_SIZE == 0);
- ut_ad(os_aio_validate());
- wake_later = mode & OS_AIO_SIMULATED_WAKE_LATER;
- mode = mode & (~OS_AIO_SIMULATED_WAKE_LATER);
-
- if (mode == OS_AIO_SYNC
- #ifdef WIN_ASYNC_IO
- && !os_aio_use_native_aio
- #endif
- ) {
- /* This is actually an ordinary synchronous read or write:
- no need to use an i/o-handler thread. NOTE that if we use
- Windows async i/o, Windows does not allow us to use
- ordinary synchronous os_file_read etc. on the same file,
- therefore we have built a special mechanism for synchronous
- wait in the Windows case. */
- if (type == OS_FILE_READ) {
- return(os_file_read(file, buf, offset, offset_high, n));
- }
- ut_a(type == OS_FILE_WRITE);
- return(os_file_write(name, file, buf, offset, offset_high, n));
- }
- try_again:
- if (mode == OS_AIO_NORMAL) {
- if (type == OS_FILE_READ) {
- array = os_aio_read_array;
- } else {
- array = os_aio_write_array;
- }
- } else if (mode == OS_AIO_IBUF) {
- ut_ad(type == OS_FILE_READ);
- array = os_aio_ibuf_array;
- } else if (mode == OS_AIO_LOG) {
- array = os_aio_log_array;
- } else if (mode == OS_AIO_SYNC) {
- array = os_aio_sync_array;
- } else {
- ut_error;
- }
-
- slot = os_aio_array_reserve_slot(type, array, message1, message2, file,
- name, buf, offset, offset_high, n);
- if (type == OS_FILE_READ) {
- if (os_aio_use_native_aio) {
- #ifdef WIN_ASYNC_IO
- ret = ReadFile(file, buf, (DWORD)n, &len,
- &(slot->control));
- #elif defined(POSIX_ASYNC_IO)
- slot->control.aio_lio_opcode = LIO_READ;
- err = (ulint) aio_read(&(slot->control));
- printf("Starting Posix aio read %lun", err);
- #endif
- } else {
- if (!wake_later) {
- os_aio_simulated_wake_handler_thread(
- os_aio_get_segment_no_from_slot(array, slot));
- }
- }
- } else if (type == OS_FILE_WRITE) {
- if (os_aio_use_native_aio) {
- #ifdef WIN_ASYNC_IO
- ret = WriteFile(file, buf, (DWORD)n, &len,
- &(slot->control));
- #elif defined(POSIX_ASYNC_IO)
- slot->control.aio_lio_opcode = LIO_WRITE;
- err = (ulint) aio_write(&(slot->control));
- printf("Starting Posix aio write %lun", err);
- #endif
- } else {
- if (!wake_later) {
- os_aio_simulated_wake_handler_thread(
- os_aio_get_segment_no_from_slot(array, slot));
- }
- }
- } else {
- ut_error;
- }
- #ifdef WIN_ASYNC_IO
- if (os_aio_use_native_aio) {
- if ((ret && len == n)
- || (!ret && GetLastError() == ERROR_IO_PENDING)) {
- /* aio was queued successfully! */
-
- if (mode == OS_AIO_SYNC) {
- /* We want a synchronous i/o operation on a file
- where we also use async i/o: in Windows we must
- use the same wait mechanism as for async i/o */
-
- return(os_aio_windows_handle(ULINT_UNDEFINED,
- slot->pos,
- &dummy_mess1, &dummy_mess2));
- }
- return(TRUE);
- }
- goto error_handling;
- }
- #endif
- if (err == 0) {
- /* aio was queued successfully! */
- return(TRUE);
- }
- os_aio_array_free_slot(array, slot);
- retry = os_file_handle_error(file, name);
- if (retry) {
- goto try_again;
- }
- ut_error;
-
- return(FALSE);
- }
- #ifdef WIN_ASYNC_IO
- /**************************************************************************
- This function is only used in Windows asynchronous i/o.
- Waits for an aio operation to complete. This function is used to wait the
- for completed requests. The aio array of pending requests is divided
- into segments. The thread specifies which segment or slot it wants to wait
- for. NOTE: this function will also take care of freeing the aio slot,
- therefore no other thread is allowed to do the freeing! */
- ibool
- os_aio_windows_handle(
- /*==================*/
- /* out: TRUE if the aio operation succeeded */
- ulint segment, /* in: the number of the segment in the aio
- arrays to wait for; segment 0 is the ibuf
- i/o thread, segment 1 the log i/o thread,
- then follow the non-ibuf read threads, and as
- the last are the non-ibuf write threads; if
- this is ULINT_UNDEFINED, then it means that
- sync aio is used, and this parameter is
- ignored */
- ulint pos, /* this parameter is used only in sync aio:
- wait for the aio slot at this position */
- void** message1, /* out: the messages passed with the aio
- request; note that also in the case where
- the aio operation failed, these output
- parameters are valid and can be used to
- restart the operation, for example */
- void** message2)
- {
- os_aio_array_t* array;
- os_aio_slot_t* slot;
- ulint n;
- ulint i;
- ibool ret_val;
- ulint err;
- BOOL ret;
- DWORD len;
- if (segment == ULINT_UNDEFINED) {
- array = os_aio_sync_array;
- segment = 0;
- } else {
- segment = os_aio_get_array_and_local_segment(&array, segment);
- }
-
- /* NOTE! We only access constant fields in os_aio_array. Therefore
- we do not have to acquire the protecting mutex yet */
- ut_ad(os_aio_validate());
- ut_ad(segment < array->n_segments);
- n = array->n_slots / array->n_segments;
- if (array == os_aio_sync_array) {
- ut_ad(pos < array->n_slots);
- os_event_wait(array->events[pos]);
- i = pos;
- } else {
- i = os_event_wait_multiple(n, (array->events) + segment * n);
- }
- os_mutex_enter(array->mutex);
- slot = os_aio_array_get_nth_slot(array, i + segment * n);
- ut_a(slot->reserved);
- ret = GetOverlappedResult(slot->file, &(slot->control), &len, TRUE);
- *message1 = slot->message1;
- *message2 = slot->message2;
- if (ret && len == slot->len) {
- ret_val = TRUE;
- } else {
- err = GetLastError();
- ut_error;
- ret_val = FALSE;
- }
- os_mutex_exit(array->mutex);
- os_aio_array_free_slot(array, slot);
-
- return(ret_val);
- }
- #endif
- #ifdef POSIX_ASYNC_IO
- /**************************************************************************
- This function is only used in Posix asynchronous i/o. Waits for an aio
- operation to complete. */
- ibool
- os_aio_posix_handle(
- /*================*/
- /* out: TRUE if the aio operation succeeded */
- ulint array_no, /* in: array number 0 - 3 */
- void** message1, /* out: the messages passed with the aio
- request; note that also in the case where
- the aio operation failed, these output
- parameters are valid and can be used to
- restart the operation, for example */
- void** message2)
- {
- os_aio_array_t* array;
- os_aio_slot_t* slot;
- siginfo_t info;
- sigset_t sigset;
- sigset_t proc_sigset;
- sigset_t thr_sigset;
- int ret;
- int i;
- int sig;
-
- sigemptyset(&sigset);
- sigaddset(&sigset, SIGRTMIN + 1 + array_no);
- pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
- /*
- sigprocmask(0, NULL, &proc_sigset);
- pthread_sigmask(0, NULL, &thr_sigset);
- for (i = 32 ; i < 40; i++) {
- printf("%lu : %lu %lun", (ulint)i,
- (ulint)sigismember(&proc_sigset, i),
- (ulint)sigismember(&thr_sigset, i));
- }
- */
- ret = sigwaitinfo(&sigset, &info);
- if (sig != SIGRTMIN + 1 + array_no) {
- ut_a(0);
-
- return(FALSE);
- }
-
- printf("Handling Posix aion");
- array = os_aio_get_array_from_no(array_no);
- os_mutex_enter(array->mutex);
- slot = info.si_value.sival_ptr;
- ut_a(slot->reserved);
- *message1 = slot->message1;
- *message2 = slot->message2;
- os_mutex_exit(array->mutex);
- os_aio_array_free_slot(array, slot);
-
- return(TRUE);
- }
- #endif
- /**************************************************************************
- Does simulated aio. This function should be called by an i/o-handler
- thread. */
- ibool
- os_aio_simulated_handle(
- /*====================*/
- /* out: TRUE if the aio operation succeeded */
- ulint global_segment, /* in: the number of the segment in the aio
- arrays to wait for; segment 0 is the ibuf
- i/o thread, segment 1 the log i/o thread,
- then follow the non-ibuf read threads, and as
- the last are the non-ibuf write threads */
- void** message1, /* out: the messages passed with the aio
- request; note that also in the case where
- the aio operation failed, these output
- parameters are valid and can be used to
- restart the operation, for example */
- void** message2)
- {
- os_aio_array_t* array;
- ulint segment;
- os_aio_slot_t* slot;
- os_aio_slot_t* slot2;
- os_aio_slot_t* consecutive_ios[OS_AIO_MERGE_N_CONSECUTIVE];
- ulint n_consecutive;
- ulint total_len;
- ulint offs;
- ulint lowest_offset;
- byte* combined_buf;
- ibool ret;
- ulint n;
- ulint i;
- segment = os_aio_get_array_and_local_segment(&array, global_segment);
-
- restart:
- /* Give other threads chance to add several i/os to the array
- at once */
-
- os_thread_yield();
- /* NOTE! We only access constant fields in os_aio_array. Therefore
- we do not have to acquire the protecting mutex yet */
- ut_ad(os_aio_validate());
- ut_ad(segment < array->n_segments);
- n = array->n_slots / array->n_segments;
- /* Look through n slots after the segment * n'th slot */
- os_mutex_enter(array->mutex);
- /* Check if there is a slot for which the i/o has already been
- done */
-
- for (i = 0; i < n; i++) {
- slot = os_aio_array_get_nth_slot(array, i + segment * n);
- if (slot->reserved && slot->io_already_done) {
- ret = TRUE;
-
- goto slot_io_done;
- }
- }
- n_consecutive = 0;
- /* Look for an i/o request at the lowest offset in the array */
- lowest_offset = ULINT_MAX;
-
- for (i = 0; i < n; i++) {
- slot = os_aio_array_get_nth_slot(array, i + segment * n);
- if (slot->reserved && slot->offset < lowest_offset) {
- /* Found an i/o request */
- consecutive_ios[0] = slot;
- n_consecutive = 1;
- lowest_offset = slot->offset;
- }
- }
- if (n_consecutive == 0) {
- /* No i/o requested at the moment */
- goto wait_for_io;
- }
- slot = consecutive_ios[0];
- /* Check if there are several consecutive blocks to read or write */
- consecutive_loop:
- for (i = 0; i < n; i++) {
- slot2 = os_aio_array_get_nth_slot(array, i + segment * n);
- if (slot2->reserved && slot2 != slot
- && slot2->offset == slot->offset + slot->len
- && slot->offset + slot->len > slot->offset /* check that
- sum does not wrap over */
- && slot2->offset_high == slot->offset_high
- && slot2->type == slot->type
- && slot2->file == slot->file) {
- /* Found a consecutive i/o request */
- consecutive_ios[n_consecutive] = slot2;
- n_consecutive++;
- slot = slot2;
- if (n_consecutive < OS_AIO_MERGE_N_CONSECUTIVE) {
-
- goto consecutive_loop;
- } else {
- break;
- }
- }
- }
- /* We have now collected n_consecutive i/o requests in the array;
- allocate a single buffer which can hold all data, and perform the
- i/o */
- total_len = 0;
- slot = consecutive_ios[0];
-
- for (i = 0; i < n_consecutive; i++) {
- total_len += consecutive_ios[i]->len;
- }
- if (n_consecutive == 1) {
- /* We can use the buffer of the i/o request */
- combined_buf = slot->buf;
- } else {
- combined_buf = ut_malloc(total_len);
- ut_a(combined_buf);
- }
-
- /* We release the array mutex for the time of the i/o: NOTE that
- this assumes that there is just one i/o-handler thread serving
- a single segment of slots! */
- os_mutex_exit(array->mutex);
- if (slot->type == OS_FILE_WRITE && n_consecutive > 1) {
- /* Copy the buffers to the combined buffer */
- offs = 0;
-
- for (i = 0; i < n_consecutive; i++) {
- ut_memcpy(combined_buf + offs, consecutive_ios[i]->buf,
- consecutive_ios[i]->len);
- offs += consecutive_ios[i]->len;
- }
- }
- /* Do the i/o with ordinary, synchronous i/o functions: */
- if (slot->type == OS_FILE_WRITE) {
- ret = os_file_write(slot->name, slot->file, combined_buf,
- slot->offset, slot->offset_high, total_len);
- } else {
- ret = os_file_read(slot->file, combined_buf,
- slot->offset, slot->offset_high, total_len);
- }
- ut_a(ret);
-
- /* printf("aio: %lu consecutive %lu:th segment, first offs %lu blocksn",
- n_consecutive, global_segment, slot->offset
- / UNIV_PAGE_SIZE); */
- if (slot->type == OS_FILE_READ && n_consecutive > 1) {
- /* Copy the combined buffer to individual buffers */
- offs = 0;
-
- for (i = 0; i < n_consecutive; i++) {
- ut_memcpy(consecutive_ios[i]->buf, combined_buf + offs,
- consecutive_ios[i]->len);
- offs += consecutive_ios[i]->len;
- }
- }
- if (n_consecutive > 1) {
- ut_free(combined_buf);
- }
- os_mutex_enter(array->mutex);
- /* Mark the i/os done in slots */
- for (i = 0; i < n_consecutive; i++) {
- consecutive_ios[i]->io_already_done = TRUE;
- }
- /* We return the messages for the first slot now, and if there were
- several slots, the messages will be returned with subsequent calls
- of this function */
-
- slot_io_done:
- ut_a(slot->reserved);
- *message1 = slot->message1;
- *message2 = slot->message2;
- os_mutex_exit(array->mutex);
- os_aio_array_free_slot(array, slot);
-
- return(ret);
- wait_for_io:
- /* We wait here until there again can be i/os in the segment
- of this thread */
-
- os_event_reset(os_aio_segment_wait_events[global_segment]);
- os_mutex_exit(array->mutex);
- os_event_wait(os_aio_segment_wait_events[global_segment]);
- goto restart;
- }
- /**************************************************************************
- Validates the consistency of an aio array. */
- static
- ibool
- os_aio_array_validate(
- /*==================*/
- /* out: TRUE if ok */
- os_aio_array_t* array) /* in: aio wait array */
- {
- os_aio_slot_t* slot;
- ulint n_reserved = 0;
- ulint i;
-
- ut_a(array);
- os_mutex_enter(array->mutex);
- ut_a(array->n_slots > 0);
- ut_a(array->n_segments > 0);
-
- for (i = 0; i < array->n_slots; i++) {
- slot = os_aio_array_get_nth_slot(array, i);
-
- if (slot->reserved) {
- n_reserved++;
- ut_a(slot->len > 0);
- }
- }
- ut_a(array->n_reserved == n_reserved);
- os_mutex_exit(array->mutex);
- return(TRUE);
- }
- /**************************************************************************
- Validates the consistency the aio system. */
- ibool
- os_aio_validate(void)
- /*=================*/
- /* out: TRUE if ok */
- {
- os_aio_array_validate(os_aio_read_array);
- os_aio_array_validate(os_aio_write_array);
- os_aio_array_validate(os_aio_ibuf_array);
- os_aio_array_validate(os_aio_log_array);
- os_aio_array_validate(os_aio_sync_array);
- return(TRUE);
- }
- /**************************************************************************
- Prints info of the aio arrays. */
- void
- os_aio_print(void)
- /*==============*/
- {
- os_aio_array_t* array;
- os_aio_slot_t* slot;
- ulint n_reserved;
- ulint i;
-
- array = os_aio_read_array;
- loop:
- ut_a(array);
-
- printf("INFO OF AN AIO ARRAYn");
- os_mutex_enter(array->mutex);
- ut_a(array->n_slots > 0);
- ut_a(array->n_segments > 0);
-
- n_reserved = 0;
- for (i = 0; i < array->n_slots; i++) {
- slot = os_aio_array_get_nth_slot(array, i);
-
- if (slot->reserved) {
- n_reserved++;
- printf("Reserved slot, messages %lx %lxn",
- (ulint)slot->message1,
- (ulint)slot->message2);
- ut_a(slot->len > 0);
- }
- }
- ut_a(array->n_reserved == n_reserved);
- printf("Total of %lu reserved aio slotsn", n_reserved);
-
- os_mutex_exit(array->mutex);
- if (array == os_aio_read_array) {
- array = os_aio_write_array;
- goto loop;
- }
- if (array == os_aio_write_array) {
- array = os_aio_ibuf_array;
- goto loop;
- }
- if (array == os_aio_ibuf_array) {
- array = os_aio_log_array;
- goto loop;
- }
- if (array == os_aio_log_array) {
- array = os_aio_sync_array;
- goto loop;
- }
- }
- /**************************************************************************
- Checks that all slots in the system have been freed, that is, there are
- no pending io operations. */
- ibool
- os_aio_all_slots_free(void)
- /*=======================*/
- /* out: TRUE if all free */
- {
- os_aio_array_t* array;
- ulint n_res = 0;
-
- array = os_aio_read_array;
- os_mutex_enter(array->mutex);
- n_res += array->n_reserved;
-
- os_mutex_exit(array->mutex);
- array = os_aio_write_array;
- os_mutex_enter(array->mutex);
- n_res += array->n_reserved;
-
- os_mutex_exit(array->mutex);
- array = os_aio_ibuf_array;
- os_mutex_enter(array->mutex);
- n_res += array->n_reserved;
-
- os_mutex_exit(array->mutex);
- array = os_aio_log_array;
- os_mutex_enter(array->mutex);
- n_res += array->n_reserved;
-
- os_mutex_exit(array->mutex);
- array = os_aio_sync_array;
- os_mutex_enter(array->mutex);
- n_res += array->n_reserved;
-
- os_mutex_exit(array->mutex);
- if (n_res == 0) {
- return(TRUE);
- }
- return(FALSE);
- }