/* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
/* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
-/* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2007-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
-typedef struct xbt_os_thread_ {
- pthread_t t;
- void *param;
- pvoid_f_pvoid_t start_routine;
-} s_xbt_os_thread_t;
-static xbt_os_thread_t main_thread = NULL;
-
-/* thread-specific data containing the xbt_os_thread_t structure */
-static int thread_mod_inited = 0;
-
-/* defaults attribute for pthreads */
-static pthread_attr_t thread_attr;
-
-/* frees the xbt_os_thread_t corresponding to the current thread */
-static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
-{
- if (thread == main_thread) /* just killed main thread */
- main_thread = NULL;
- free(thread);
-}
-
-void xbt_os_thread_mod_preinit(void)
-{
- if (thread_mod_inited)
- return;
-
- main_thread = xbt_new(s_xbt_os_thread_t, 1);
- main_thread->param = NULL;
- main_thread->start_routine = NULL;
-
- pthread_attr_init(&thread_attr);
-
- thread_mod_inited = 1;
-}
-
-void xbt_os_thread_mod_postexit(void)
-{
- free(main_thread);
- main_thread = NULL;
- thread_mod_inited = 0;
-}
-
-/** Calls pthread_atfork() if present, and raise an exception otherwise.
- *
- * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
- * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
- * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
- */
-
-/* this function is critical to tesh+mmalloc, don't mess with it */
-int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
-{
- return pthread_atfork(prepare, parent, child);
-}
-
-static void *wrapper_start_routine(void *s)
-{
- xbt_os_thread_t t = s;
-
- return t->start_routine(t->param);
-}
-
-xbt_os_thread_t xbt_os_thread_create(pvoid_f_pvoid_t start_routine, void* param)
-{
- xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
- res_thread->start_routine = start_routine;
- res_thread->param = param;
-
- int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
- xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
-
- return res_thread;
-}
-
-/** Bind the thread to the given core, if possible.
- *
- * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
- */
-int xbt_os_thread_bind(XBT_ATTRIB_UNUSED xbt_os_thread_t thread, XBT_ATTRIB_UNUSED int cpu)
-{
- int errcode = 0;
-#if HAVE_PTHREAD_SETAFFINITY
- pthread_t pthread = thread->t;
- cpu_set_t cpuset;
- CPU_ZERO(&cpuset);
- CPU_SET(cpu, &cpuset);
- errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
-#endif
- return errcode;
-}
-
-void xbt_os_thread_setstacksize(int stack_size)
-{
- size_t alignment[] = {
- xbt_pagesize,
-#ifdef PTHREAD_STACK_MIN
- PTHREAD_STACK_MIN,
-#endif
- 0
- };
-
- xbt_assert(stack_size >= 0, "stack size %d is negative, maybe it exceeds MAX_INT?", stack_size);
-
- size_t sz = stack_size;
- int res = pthread_attr_setstacksize(&thread_attr, sz);
-
- for (int i = 0; res == EINVAL && alignment[i] > 0; i++) {
- /* Invalid size, try again with next multiple of alignment[i]. */
- size_t rem = sz % alignment[i];
- if (rem != 0 || sz == 0) {
- size_t sz2 = sz - rem + alignment[i];
- XBT_DEBUG("pthread_attr_setstacksize failed for %zu, try again with %zu", sz, sz2);
- sz = sz2;
- res = pthread_attr_setstacksize(&thread_attr, sz);
- }
- }
-
- if (res == EINVAL)
- XBT_WARN("invalid stack size (maybe too big): %zu", sz);
- else if (res != 0)
- XBT_WARN("unknown error %d in pthread stacksize setting: %zu", res, sz);
-}
-
-void xbt_os_thread_setguardsize(int guard_size)
-{
-#ifdef WIN32
- THROW_UNIMPLEMENTED; //pthread_attr_setguardsize is not implemented in pthread.h on windows
-#else
- size_t sz = guard_size;
- int res = pthread_attr_setguardsize(&thread_attr, sz);
- if (res)
- XBT_WARN("pthread_attr_setguardsize failed (%d) for size: %zu", res, sz);
-#endif
-}
-
-void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
-{
- int errcode = pthread_join(thread->t, thread_return);
-
- xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
- xbt_os_thread_free_thread_data(thread);
-}
-
-void xbt_os_thread_exit(int *retval)
-{
- pthread_exit(retval);
-}
-
/****** mutex related functions ******/
typedef struct xbt_os_mutex_ {
pthread_mutex_t m;
