1 /* context_sysv - context switching with ucontextes from System V */
3 /* Copyright (c) 2009, 2010. 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 "gras_config.h"
14 #include "context_sysv_config.h" /* loads context system definitions */
17 # include <win32_ucontext.h> /* context relative declarations */
19 # include <ucontext.h> /* context relative declarations */
22 #ifdef HAVE_VALGRIND_VALGRIND_H
23 # include <valgrind/valgrind.h>
24 #endif /* HAVE_VALGRIND_VALGRIND_H */
26 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
28 #ifdef CONTEXT_THREADS
29 static xbt_parmap_t sysv_parmap;
30 static ucontext_t* sysv_workers_stacks; /* space to save the worker's stack in each thread */
31 static unsigned long sysv_threads_working; /* number of threads that have started their work */
32 static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */
34 static unsigned long sysv_process_index = 0; /* index of the next process to run in the
35 * list of runnable processes */
36 static smx_ctx_sysv_t sysv_maestro_context;
38 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
40 smx_ctx_sysv_create_context_sized(size_t structure_size,
41 xbt_main_func_t code, int argc,
43 void_pfn_smxprocess_t cleanup_func,
45 static void smx_ctx_sysv_free(smx_context_t context);
47 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
48 void_pfn_smxprocess_t cleanup_func, void* data);
50 static void smx_ctx_sysv_wrapper(int count, ...);
52 static void smx_ctx_sysv_stop_serial(smx_context_t context);
53 static void smx_ctx_sysv_suspend_serial(smx_context_t context);
54 static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
55 static void smx_ctx_sysv_runall_serial(void);
57 static void smx_ctx_sysv_stop_parallel(smx_context_t context);
58 static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
59 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
60 static void smx_ctx_sysv_runall_parallel(void);
62 /* This is a bit paranoid about sizeof(smx_ctx_sysv_t) not being a multiple of
63 * sizeof(int), but it doesn't harm. */
64 #define CTX_ADDR_LEN \
65 (sizeof(smx_ctx_sysv_t) / sizeof(int) + \
66 !!(sizeof(smx_ctx_sysv_t) % sizeof(int)))
68 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
70 smx_ctx_base_factory_init(factory);
71 XBT_VERB("Activating SYSV context factory");
73 (*factory)->finalize = smx_ctx_sysv_factory_finalize;
74 (*factory)->create_context = smx_ctx_sysv_create_context;
75 /* Do not overload that method (*factory)->finalize */
76 (*factory)->free = smx_ctx_sysv_free;
77 (*factory)->name = "smx_sysv_context_factory";
79 if (SIMIX_context_is_parallel()) {
80 #ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
81 int nthreads = SIMIX_context_get_nthreads();
82 sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
83 sysv_workers_stacks = xbt_new(ucontext_t, nthreads);
84 xbt_os_thread_key_create(&sysv_worker_id_key);
85 (*factory)->stop = smx_ctx_sysv_stop_parallel;
86 (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
87 (*factory)->runall = smx_ctx_sysv_runall_parallel;
89 THROWF(arg_error, 0, "No thread support for parallel context execution");
92 (*factory)->stop = smx_ctx_sysv_stop_serial;
93 (*factory)->suspend = smx_ctx_sysv_suspend_serial;
94 (*factory)->runall = smx_ctx_sysv_runall_serial;
98 static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
100 #ifdef CONTEXT_THREADS
102 xbt_parmap_destroy(sysv_parmap);
103 xbt_free(sysv_workers_stacks);
105 return smx_ctx_base_factory_finalize(factory);
109 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
110 int argc, char **argv,
111 void_pfn_smxprocess_t cleanup_func,
114 int ctx_addr[CTX_ADDR_LEN];
115 smx_ctx_sysv_t context =
116 (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
123 /* if the user provided a function for the process then use it,
124 otherwise it is the context for maestro */
127 getcontext(&(context->uc));
129 context->uc.uc_link = NULL;
131 context->uc.uc_stack.ss_sp =
132 pth_skaddr_makecontext(context->stack, smx_context_stack_size);
134 context->uc.uc_stack.ss_size =
135 pth_sksize_makecontext(context->stack, smx_context_stack_size);
137 #ifdef HAVE_VALGRIND_VALGRIND_H
138 context->valgrind_stack_id =
139 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
140 ((char *) context->uc.uc_stack.ss_sp) +
141 context->uc.uc_stack.ss_size);
142 #endif /* HAVE_VALGRIND_VALGRIND_H */
143 memcpy(ctx_addr, &context, sizeof(smx_ctx_sysv_t));
144 switch (CTX_ADDR_LEN) {
146 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
150 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
151 2, ctx_addr[0], ctx_addr[1]);
154 xbt_die("Ucontexts are not supported on this arch yet (addr len = %zu/%zu = %zu)",
155 sizeof(smx_ctx_sysv_t), sizeof(int), CTX_ADDR_LEN);
158 sysv_maestro_context = context;
161 return (smx_context_t) context;
165 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
166 void_pfn_smxprocess_t cleanup_func,
170 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
171 code, argc, argv, cleanup_func,
176 static void smx_ctx_sysv_free(smx_context_t context)
181 #ifdef HAVE_VALGRIND_VALGRIND_H
182 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
183 context)->valgrind_stack_id);
184 #endif /* HAVE_VALGRIND_VALGRIND_H */
187 smx_ctx_base_free(context);
190 static void smx_ctx_sysv_wrapper(int first, ...)
192 int ctx_addr[CTX_ADDR_LEN];
193 smx_ctx_sysv_t context;
196 if (CTX_ADDR_LEN > 1) {
200 for (i = 1; i < CTX_ADDR_LEN; i++)
201 ctx_addr[i] = va_arg(ap, int);
204 memcpy(&context, ctx_addr, sizeof(smx_ctx_sysv_t));
205 (context->super.code) (context->super.argc, context->super.argv);
207 simix_global->context_factory->stop((smx_context_t) context);
210 static void smx_ctx_sysv_stop_serial(smx_context_t context)
212 smx_ctx_base_stop(context);
213 smx_ctx_sysv_suspend_serial(context);
216 static void smx_ctx_sysv_suspend_serial(smx_context_t context)
218 /* determine the next context */
219 smx_context_t next_context;
220 unsigned long int i = sysv_process_index++;
222 if (i < xbt_dynar_length(simix_global->process_to_run)) {
223 /* execute the next process */
224 XBT_DEBUG("Run next process");
225 next_context = xbt_dynar_get_as(
226 simix_global->process_to_run,i, smx_process_t)->context;
229 /* all processes were run, return to maestro */
230 XBT_DEBUG("No more process to run");
231 next_context = (smx_context_t) sysv_maestro_context;
233 SIMIX_context_set_current(next_context);
234 swapcontext(&((smx_ctx_sysv_t) context)->uc,
235 &((smx_ctx_sysv_t) next_context)->uc);
238 static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
240 smx_context_t context = first_process->context;
241 SIMIX_context_set_current(context);
242 swapcontext(&sysv_maestro_context->uc,
243 &((smx_ctx_sysv_t) context)->uc);
246 static void smx_ctx_sysv_runall_serial(void)
248 if (!xbt_dynar_is_empty(simix_global->process_to_run)) {
249 smx_process_t first_process =
250 xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
251 sysv_process_index = 1;
253 /* execute the first process */
254 smx_ctx_sysv_resume_serial(first_process);
258 static void smx_ctx_sysv_stop_parallel(smx_context_t context)
260 smx_ctx_base_stop(context);
261 smx_ctx_sysv_suspend_parallel(context);
264 static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
266 #ifdef CONTEXT_THREADS
267 /* determine the next context */
268 smx_process_t next_work = xbt_parmap_next(sysv_parmap);
269 smx_context_t next_context;
270 ucontext_t* next_stack;
272 if (next_work != NULL) {
273 /* there is a next process to resume */
274 XBT_DEBUG("Run next process");
275 next_context = next_work->context;
276 next_stack = &((smx_ctx_sysv_t) next_context)->uc;
279 /* all processes were run, go to the barrier */
280 XBT_DEBUG("No more processes to run");
281 next_context = (smx_context_t) sysv_maestro_context;
282 unsigned long worker_id =
283 (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key);
284 next_stack = &sysv_workers_stacks[worker_id];
287 SIMIX_context_set_current(next_context);
288 swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack);
292 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
294 #ifdef CONTEXT_THREADS
295 unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1);
296 xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id);
297 ucontext_t* worker_stack = &sysv_workers_stacks[worker_id];
299 smx_context_t context = first_process->context;
300 SIMIX_context_set_current(context);
301 swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc);
305 static void smx_ctx_sysv_runall_parallel(void)
307 #ifdef CONTEXT_THREADS
308 sysv_threads_working = 0;
309 xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
310 simix_global->process_to_run);