1 /* Copyright (c) 2009-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "xbt/function_types.h"
11 #include "smx_private.h"
12 #include "src/portable.h" /* loads context system definitions */
14 #include "xbt/xbt_os_thread.h"
15 #include "src/xbt_modinter.h" /* prototype of os thread module's init/exit in XBT */
17 #include "src/simix/smx_private.hpp"
18 #include "src/simix/ThreadContext.hpp"
20 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
22 static xbt_os_sem_t smx_ctx_thread_sem = nullptr;
27 XBT_PRIVATE ContextFactory* thread_factory()
29 XBT_VERB("Activating thread context factory");
30 return new ThreadContextFactory();
33 ThreadContextFactory::ThreadContextFactory()
34 : ContextFactory("ThreadContextFactory")
36 if (SIMIX_context_is_parallel()) {
37 smx_ctx_thread_sem = xbt_os_sem_init(SIMIX_context_get_nthreads());
39 smx_ctx_thread_sem = nullptr;
43 ThreadContextFactory::~ThreadContextFactory()
45 if (smx_ctx_thread_sem) {
46 xbt_os_sem_destroy(smx_ctx_thread_sem);
47 smx_ctx_thread_sem = nullptr;
51 ThreadContext* ThreadContextFactory::create_context(
52 std::function<void()> code,
53 void_pfn_smxprocess_t cleanup, smx_process_t process)
55 return this->new_context<ThreadContext>(std::move(code), cleanup, process);
58 ThreadContext::ThreadContext(std::function<void()> code,
59 void_pfn_smxprocess_t cleanup, smx_process_t process)
60 : Context(std::move(code), cleanup, process)
62 /* If the user provided a function for the process then use it
63 otherwise is the context for maestro */
65 this->begin_ = xbt_os_sem_init(0);
66 this->end_ = xbt_os_sem_init(0);
67 if (smx_context_stack_size_was_set)
68 xbt_os_thread_setstacksize(smx_context_stack_size);
69 if (smx_context_guard_size_was_set)
70 xbt_os_thread_setguardsize(smx_context_guard_size);
72 /* create and start the process */
73 /* NOTE: The first argument to xbt_os_thread_create used to be the process *
74 * name, but now the name is stored at SIMIX level, so we pass a null */
76 xbt_os_thread_create(NULL, ThreadContext::wrapper, this, this);
78 /* wait the starting of the newly created process */
79 xbt_os_sem_acquire(this->end_);
82 xbt_os_thread_set_extra_data(this);
86 void ThreadContextFactory::run_all()
88 if (smx_ctx_thread_sem == nullptr) {
90 smx_process_t process;
92 xbt_dynar_foreach(simix_global->process_to_run, cursor, process) {
93 XBT_DEBUG("Handling %p",process);
94 ThreadContext* context = static_cast<ThreadContext*>(process->context);
95 xbt_os_sem_release(context->begin_);
96 xbt_os_sem_acquire(context->end_);
101 smx_process_t process;
102 xbt_dynar_foreach(simix_global->process_to_run, index, process)
103 xbt_os_sem_release(static_cast<ThreadContext*>(process->context)->begin_);
104 xbt_dynar_foreach(simix_global->process_to_run, index, process)
105 xbt_os_sem_acquire(static_cast<ThreadContext*>(process->context)->end_);
109 ThreadContext* ThreadContextFactory::self()
111 return static_cast<ThreadContext*>(xbt_os_thread_get_extra_data());
114 ThreadContext::~ThreadContext()
116 /* check if this is the context of maestro (it doesn't have a real thread) */
118 /* wait about the thread terminason */
119 xbt_os_thread_join(this->thread_, nullptr);
121 /* destroy the synchronisation objects */
122 xbt_os_sem_destroy(this->begin_);
123 xbt_os_sem_destroy(this->end_);
127 void *ThreadContext::wrapper(void *param)
129 ThreadContext* context = static_cast<ThreadContext*>(param);
132 /* Install alternate signal stack, for SIGSEGV handler. */
134 stack.ss_sp = sigsegv_stack;
135 stack.ss_size = sizeof sigsegv_stack;
137 sigaltstack(&stack, nullptr);
139 /* Tell the maestro we are starting, and wait for its green light */
140 xbt_os_sem_release(context->end_);
141 xbt_os_sem_acquire(context->begin_);
142 if (smx_ctx_thread_sem) /* parallel run */
143 xbt_os_sem_acquire(smx_ctx_thread_sem);
150 void ThreadContext::stop()
153 if (smx_ctx_thread_sem)
154 xbt_os_sem_release(smx_ctx_thread_sem);
156 // Signal to the maestro that it has finished:
157 xbt_os_sem_release(this->end_);
159 xbt_os_thread_exit(NULL);
162 void ThreadContext::suspend()
164 if (smx_ctx_thread_sem)
165 xbt_os_sem_release(smx_ctx_thread_sem);
166 xbt_os_sem_release(this->end_);
167 xbt_os_sem_acquire(this->begin_);
168 if (smx_ctx_thread_sem)
169 xbt_os_sem_acquire(smx_ctx_thread_sem);