1 /* context_sysv - context switching with ucontexts from System V */
3 /* Copyright (c) 2009-2014. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "xbt/parmap.h"
12 #include "smx_private.h"
13 #include "internal_config.h"
14 #include "context_sysv_config.h" /* loads context system definitions */
18 # include <win32_ucontext.h> /* context relative declarations */
20 # include <ucontext.h> /* context relative declarations */
23 #ifdef HAVE_VALGRIND_VALGRIND_H
24 # include <valgrind/valgrind.h>
25 #endif /* HAVE_VALGRIND_VALGRIND_H */
27 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
29 typedef struct s_smx_ctx_sysv {
30 s_smx_ctx_base_t super; /* Fields of super implementation */
31 ucontext_t uc; /* the ucontext that executes the code */
32 #ifdef HAVE_VALGRIND_VALGRIND_H
33 unsigned int valgrind_stack_id; /* the valgrind stack id */
35 char *stack; /* the thread stack */
36 } s_smx_ctx_sysv_t, *smx_ctx_sysv_t;
38 #ifdef CONTEXT_THREADS
39 static xbt_parmap_t sysv_parmap;
40 static smx_ctx_sysv_t* sysv_workers_context; /* space to save the worker's context in each thread */
41 static unsigned long sysv_threads_working; /* number of threads that have started their work */
42 static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */
44 static unsigned long sysv_process_index = 0; /* index of the next process to run in the
45 * list of runnable processes */
46 static smx_ctx_sysv_t sysv_maestro_context;
48 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
50 smx_ctx_sysv_create_context_sized(size_t structure_size,
51 xbt_main_func_t code, int argc,
53 void_pfn_smxprocess_t cleanup_func,
54 smx_process_t process);
55 static void smx_ctx_sysv_free(smx_context_t context);
57 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
58 void_pfn_smxprocess_t cleanup_func, smx_process_t process);
60 static void smx_ctx_sysv_wrapper(int count, ...);
62 static void smx_ctx_sysv_stop_serial(smx_context_t context);
63 static void smx_ctx_sysv_suspend_serial(smx_context_t context);
64 static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
65 static void smx_ctx_sysv_runall_serial(void);
67 static void smx_ctx_sysv_stop_parallel(smx_context_t context);
68 static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
69 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
70 static void smx_ctx_sysv_runall_parallel(void);
72 /* This is a bit paranoid about sizeof(smx_ctx_sysv_t) not being a multiple of
73 * sizeof(int), but it doesn't harm. */
74 #define CTX_ADDR_LEN \
75 (sizeof(smx_ctx_sysv_t) / sizeof(int) + \
76 !!(sizeof(smx_ctx_sysv_t) % sizeof(int)))
78 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
80 smx_ctx_base_factory_init(factory);
81 XBT_VERB("Activating SYSV context factory");
83 (*factory)->finalize = smx_ctx_sysv_factory_finalize;
84 (*factory)->create_context = smx_ctx_sysv_create_context;
85 /* Do not overload that method (*factory)->finalize */
86 (*factory)->free = smx_ctx_sysv_free;
87 (*factory)->name = "smx_sysv_context_factory";
89 if (SIMIX_context_is_parallel()) {
90 #ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
91 int nthreads = SIMIX_context_get_nthreads();
92 sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
93 sysv_workers_context = xbt_new(smx_ctx_sysv_t, nthreads);
94 sysv_maestro_context = NULL;
95 xbt_os_thread_key_create(&sysv_worker_id_key);
96 (*factory)->stop = smx_ctx_sysv_stop_parallel;
97 (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
98 (*factory)->runall = smx_ctx_sysv_runall_parallel;
100 THROWF(arg_error, 0, "No thread support for parallel context execution");
103 (*factory)->stop = smx_ctx_sysv_stop_serial;
104 (*factory)->suspend = smx_ctx_sysv_suspend_serial;
105 (*factory)->runall = smx_ctx_sysv_runall_serial;
109 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
111 #ifdef CONTEXT_THREADS
113 xbt_parmap_destroy(sysv_parmap);
114 xbt_free(sysv_workers_context);
116 return smx_ctx_base_factory_finalize(factory);
120 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
121 void_pfn_smxprocess_t cleanup_func,
122 smx_process_t process)
124 int ctx_addr[CTX_ADDR_LEN];
125 smx_ctx_sysv_t context =
126 (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(
127 sizeof(s_smx_ctx_sysv_t),
134 /* if the user provided a function for the process then use it,
135 otherwise it is the context for maestro */
138 context->stack = SIMIX_context_stack_new();
139 getcontext(&(context->uc));
141 context->uc.uc_link = NULL;
143 context->uc.uc_stack.ss_sp =
144 pth_skaddr_makecontext(context->stack, smx_context_stack_size);
146 context->uc.uc_stack.ss_size =
147 pth_sksize_makecontext(context->stack, smx_context_stack_size);
149 #ifdef HAVE_VALGRIND_VALGRIND_H
150 context->valgrind_stack_id =
151 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
152 ((char *) context->uc.uc_stack.ss_sp) +
153 context->uc.uc_stack.ss_size);
154 #endif /* HAVE_VALGRIND_VALGRIND_H */
155 memcpy(ctx_addr, &context, sizeof(smx_ctx_sysv_t));
156 switch (CTX_ADDR_LEN) {
158 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
162 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
163 2, ctx_addr[0], ctx_addr[1]);
166 xbt_die("Ucontexts are not supported on this arch yet (addr len = %zu/%zu = %zu)",
167 sizeof(smx_ctx_sysv_t), sizeof(int), CTX_ADDR_LEN);
170 if (process != NULL && sysv_maestro_context == NULL)
171 sysv_maestro_context = context;
174 if(MC_is_active() && code)
175 MC_new_stack_area(context, ((smx_context_t)context)->process->name,
176 &(context->uc), sizeof(s_smx_ctx_sysv_t));
178 return (smx_context_t) context;
181 static void smx_ctx_sysv_free(smx_context_t context)
186 #ifdef HAVE_VALGRIND_VALGRIND_H
187 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
188 context)->valgrind_stack_id);
189 #endif /* HAVE_VALGRIND_VALGRIND_H */
190 SIMIX_context_stack_delete(((smx_ctx_sysv_t)context)->stack);
192 smx_ctx_base_free(context);
195 static void smx_ctx_sysv_wrapper(int first, ...)
197 int ctx_addr[CTX_ADDR_LEN];
198 smx_ctx_sysv_t context;
201 if (CTX_ADDR_LEN > 1) {
205 for (i = 1; i < CTX_ADDR_LEN; i++)
206 ctx_addr[i] = va_arg(ap, int);
209 memcpy(&context, ctx_addr, sizeof(smx_ctx_sysv_t));
210 (context->super.code) (context->super.argc, context->super.argv);
212 simix_global->context_factory->stop((smx_context_t) context);
215 static void smx_ctx_sysv_stop_serial(smx_context_t context)
217 smx_ctx_base_stop(context);
218 smx_ctx_sysv_suspend_serial(context);
221 static void smx_ctx_sysv_suspend_serial(smx_context_t context)
223 /* determine the next context */
224 smx_context_t next_context;
225 unsigned long int i = sysv_process_index++;
227 if (i < xbt_dynar_length(simix_global->process_to_run)) {
228 /* execute the next process */
229 XBT_DEBUG("Run next process");
230 next_context = xbt_dynar_get_as(
231 simix_global->process_to_run,i, smx_process_t)->context;
234 /* all processes were run, return to maestro */
235 XBT_DEBUG("No more process to run");
236 next_context = (smx_context_t) sysv_maestro_context;
238 SIMIX_context_set_current(next_context);
239 swapcontext(&((smx_ctx_sysv_t) context)->uc,
240 &((smx_ctx_sysv_t) next_context)->uc);
243 static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
245 smx_context_t context = first_process->context;
246 SIMIX_context_set_current(context);
247 swapcontext(&sysv_maestro_context->uc,
248 &((smx_ctx_sysv_t) context)->uc);
251 static void smx_ctx_sysv_runall_serial(void)
253 smx_process_t first_process =
254 xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
255 sysv_process_index = 1;
257 /* execute the first process */
258 smx_ctx_sysv_resume_serial(first_process);
261 static void smx_ctx_sysv_stop_parallel(smx_context_t context)
263 smx_ctx_base_stop(context);
264 smx_ctx_sysv_suspend_parallel(context);
267 static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
269 #ifdef CONTEXT_THREADS
270 /* determine the next context */
271 smx_process_t next_work = xbt_parmap_next(sysv_parmap);
272 smx_context_t next_context;
273 ucontext_t* next_stack;
275 if (next_work != NULL) {
276 /* there is a next process to resume */
277 XBT_DEBUG("Run next process");
278 next_context = next_work->context;
279 next_stack = &((smx_ctx_sysv_t) next_context)->uc;
282 /* all processes were run, go to the barrier */
283 XBT_DEBUG("No more processes to run");
284 unsigned long worker_id =
285 (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key);
286 next_context = (smx_context_t)sysv_workers_context[worker_id];
287 next_stack = &((smx_ctx_sysv_t)next_context)->uc;
290 SIMIX_context_set_current(next_context);
291 swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack);
295 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
297 #ifdef CONTEXT_THREADS
298 unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1);
299 xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id);
300 smx_ctx_sysv_t worker_context = (smx_ctx_sysv_t)SIMIX_context_self();
301 sysv_workers_context[worker_id] = worker_context;
302 ucontext_t* worker_stack = &worker_context->uc;
304 smx_context_t context = first_process->context;
305 SIMIX_context_set_current(context);
306 swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc);
310 static void smx_ctx_sysv_runall_parallel(void)
312 #ifdef CONTEXT_THREADS
313 sysv_threads_working = 0;
314 xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
315 simix_global->process_to_run);