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;
51 static xbt_os_thread_t main_thread = NULL;
53 /* thread-specific data containing the xbt_os_thread_t structure */
54 static int thread_mod_inited = 0;
56 /* frees the xbt_os_thread_t corresponding to the current thread */
57 static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
59 if (thread == main_thread) /* just killed main thread */
64 void xbt_os_thread_mod_preinit(void)
66 if (thread_mod_inited)
69 main_thread = xbt_new(s_xbt_os_thread_t, 1);
70 main_thread->param = NULL;
71 main_thread->start_routine = NULL;
73 thread_mod_inited = 1;
76 void xbt_os_thread_mod_postexit(void)
80 thread_mod_inited = 0;
83 /** Calls pthread_atfork() if present, and raise an exception otherwise.
85 * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
86 * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
87 * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
90 /* this function is critical to tesh+mmalloc, don't mess with it */
91 int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
93 return pthread_atfork(prepare, parent, child);
96 static void *wrapper_start_routine(void *s)
98 xbt_os_thread_t t = s;
100 return t->start_routine(t->param);
103 xbt_os_thread_t xbt_os_thread_create(pvoid_f_pvoid_t start_routine, void* param)
105 xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
106 res_thread->start_routine = start_routine;
107 res_thread->param = param;
109 int errcode = pthread_create(&(res_thread->t), NULL, wrapper_start_routine, res_thread);
110 xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
115 /** Bind the thread to the given core, if possible.
117 * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
119 int xbt_os_thread_bind(XBT_ATTRIB_UNUSED xbt_os_thread_t thread, XBT_ATTRIB_UNUSED int cpu)
122 #if HAVE_PTHREAD_SETAFFINITY
123 pthread_t pthread = thread->t;
126 CPU_SET(cpu, &cpuset);
127 errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
132 void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
134 int errcode = pthread_join(thread->t, thread_return);
136 xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
137 xbt_os_thread_free_thread_data(thread);
140 /****** mutex related functions ******/
141 typedef struct xbt_os_mutex_ {
148 xbt_os_mutex_t xbt_os_mutex_init(void)
150 pthread_mutexattr_t Attr;
151 pthread_mutexattr_init(&Attr);
152 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
154 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
155 int errcode = pthread_mutex_init(&(res->m), &Attr);
156 xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
161 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
163 int errcode = pthread_mutex_lock(&(mutex->m));
164 xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
167 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
169 int errcode = pthread_mutex_unlock(&(mutex->m));
170 xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
173 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
178 int errcode = pthread_mutex_destroy(&(mutex->m));
179 xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));