1 /* xbt_os_thread -- portability layer over the pthread API */
2 /* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
3 /* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
5 /* Copyright (c) 2007-2019. The SimGrid Team. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "src/internal_config.h"
11 #if HAVE_PTHREAD_SETAFFINITY
18 #if defined(__FreeBSD__)
19 #include "pthread_np.h"
20 #define cpu_set_t cpuset_t
24 #include <semaphore.h>
29 #elif defined(__MACH__) && defined(__APPLE__)
31 #include <sys/types.h>
32 #include <sys/sysctl.h>
37 #include "xbt/sysdep.h"
39 #include "src/internal_config.h"
40 #include "xbt/xbt_os_time.h" /* Portable time facilities */
41 #include "xbt/xbt_os_thread.h" /* This module */
42 #include "src/xbt_modinter.h" /* Initialization/finalization of this module */
44 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
46 typedef struct xbt_os_thread_ {
49 pvoid_f_pvoid_t start_routine;
52 /** Calls pthread_atfork() if present, and raise an exception otherwise.
54 * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
55 * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
56 * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
59 /* this function is critical to tesh+mmalloc, don't mess with it */
60 int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
62 return pthread_atfork(prepare, parent, child);
65 /****** mutex related functions ******/
66 typedef struct xbt_os_mutex_ {
73 xbt_os_mutex_t xbt_os_mutex_init(void)
75 pthread_mutexattr_t Attr;
76 pthread_mutexattr_init(&Attr);
77 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
79 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
80 int errcode = pthread_mutex_init(&(res->m), &Attr);
81 xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
86 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
88 int errcode = pthread_mutex_lock(&(mutex->m));
89 xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
92 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
94 int errcode = pthread_mutex_unlock(&(mutex->m));
95 xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
98 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
103 int errcode = pthread_mutex_destroy(&(mutex->m));
104 xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));