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 /* defaults attribute for pthreads */
57 static pthread_attr_t thread_attr;
59 /* frees the xbt_os_thread_t corresponding to the current thread */
60 static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
62 if (thread == main_thread) /* just killed main thread */
67 void xbt_os_thread_mod_preinit(void)
69 if (thread_mod_inited)
72 main_thread = xbt_new(s_xbt_os_thread_t, 1);
73 main_thread->param = NULL;
74 main_thread->start_routine = NULL;
76 pthread_attr_init(&thread_attr);
78 thread_mod_inited = 1;
81 void xbt_os_thread_mod_postexit(void)
85 thread_mod_inited = 0;
88 /** Calls pthread_atfork() if present, and raise an exception otherwise.
90 * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
91 * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
92 * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
95 /* this function is critical to tesh+mmalloc, don't mess with it */
96 int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
98 return pthread_atfork(prepare, parent, child);
101 static void *wrapper_start_routine(void *s)
103 xbt_os_thread_t t = s;
105 return t->start_routine(t->param);
108 xbt_os_thread_t xbt_os_thread_create(pvoid_f_pvoid_t start_routine, void* param)
110 xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
111 res_thread->start_routine = start_routine;
112 res_thread->param = param;
114 int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
115 xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
120 /** Bind the thread to the given core, if possible.
122 * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
124 int xbt_os_thread_bind(XBT_ATTRIB_UNUSED xbt_os_thread_t thread, XBT_ATTRIB_UNUSED int cpu)
127 #if HAVE_PTHREAD_SETAFFINITY
128 pthread_t pthread = thread->t;
131 CPU_SET(cpu, &cpuset);
132 errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
137 void xbt_os_thread_setstacksize(int stack_size)
139 size_t alignment[] = {
141 #ifdef PTHREAD_STACK_MIN
147 xbt_assert(stack_size >= 0, "stack size %d is negative, maybe it exceeds MAX_INT?", stack_size);
149 size_t sz = stack_size;
150 int res = pthread_attr_setstacksize(&thread_attr, sz);
152 for (int i = 0; res == EINVAL && alignment[i] > 0; i++) {
153 /* Invalid size, try again with next multiple of alignment[i]. */
154 size_t rem = sz % alignment[i];
155 if (rem != 0 || sz == 0) {
156 size_t sz2 = sz - rem + alignment[i];
157 XBT_DEBUG("pthread_attr_setstacksize failed for %zu, try again with %zu", sz, sz2);
159 res = pthread_attr_setstacksize(&thread_attr, sz);
164 XBT_WARN("invalid stack size (maybe too big): %zu", sz);
166 XBT_WARN("unknown error %d in pthread stacksize setting: %zu", res, sz);
169 void xbt_os_thread_setguardsize(int guard_size)
172 THROW_UNIMPLEMENTED; //pthread_attr_setguardsize is not implemented in pthread.h on windows
174 size_t sz = guard_size;
175 int res = pthread_attr_setguardsize(&thread_attr, sz);
177 XBT_WARN("pthread_attr_setguardsize failed (%d) for size: %zu", res, sz);
181 void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
183 int errcode = pthread_join(thread->t, thread_return);
185 xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
186 xbt_os_thread_free_thread_data(thread);
189 void xbt_os_thread_exit(int *retval)
191 pthread_exit(retval);
194 /****** mutex related functions ******/
195 typedef struct xbt_os_mutex_ {
202 xbt_os_mutex_t xbt_os_mutex_init(void)
204 pthread_mutexattr_t Attr;
205 pthread_mutexattr_init(&Attr);
206 pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
208 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
209 int errcode = pthread_mutex_init(&(res->m), &Attr);
210 xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
215 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
217 int errcode = pthread_mutex_lock(&(mutex->m));
218 xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
221 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
223 int errcode = pthread_mutex_unlock(&(mutex->m));
224 xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
227 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
232 int errcode = pthread_mutex_destroy(&(mutex->m));
233 xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));