os_id.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:1k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 2001-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: os_id.c,v 1.2 2002/01/11 15:52:59 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <unistd.h>
- #endif
- #include "db_int.h"
- /*
- * __os_id --
- * Return a 32-bit value identifying the current thread of control.
- *
- * PUBLIC: void __os_id __P((u_int32_t *));
- */
- void
- __os_id(idp)
- u_int32_t *idp;
- {
- /*
- * By default, use the process ID.
- *
- * getpid() returns a pid_t which we convert to a u_int32_t. I have
- * not yet seen a system where a pid_t has 64-bits, but I'm sure they
- * exist. Since we're returning only the bottom 32-bits, you cannot
- * use the return of __os_id to reference a process (for example, you
- * cannot send a signal to the value returned by __os_id). To send a
- * signal to the current process, use raise(3) instead.
- */
- #ifdef HAVE_VXWORKS
- *idp = taskIdSelf();
- #else
- *idp = getpid();
- #endif
- }