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 "smx_context_sysv_private.h"
12 #include "xbt/parmap.h"
13 #include "simix/private.h"
14 #include "gras_config.h"
16 #ifdef HAVE_VALGRIND_VALGRIND_H
17 # include <valgrind/valgrind.h>
18 #endif /* HAVE_VALGRIND_VALGRIND_H */
21 #include "win32_ucontext.h"
26 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
28 #ifdef CONTEXT_THREADS
29 static xbt_parmap_t parmap;
30 static ucontext_t* smx_ctx_sysv_local_maestro_uc; /* space to save maestro's stack in each thead */
32 static unsigned long smx_ctx_sysv_process_index = 0; /* index of the next process to run in the
33 * list of runnable processes */
34 static smx_ctx_sysv_t smx_ctx_sysv_maestro_context;
38 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
39 void_pfn_smxprocess_t cleanup_func, void* data);
41 static void smx_ctx_sysv_wrapper(int count, ...);
43 static void smx_ctx_sysv_stop_serial(smx_context_t context);
44 static void smx_ctx_sysv_suspend_serial(smx_context_t context);
45 static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
46 static void smx_ctx_sysv_runall_serial(void);
48 static void smx_ctx_sysv_stop_parallel(smx_context_t context);
49 static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
50 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
51 static void smx_ctx_sysv_runall_parallel(void);
54 /* This is a bit paranoid about SIZEOF_VOIDP not being a multiple of SIZEOF_INT,
55 * but it doesn't harm. */
56 #define CTX_ADDR_LEN (SIZEOF_VOIDP / SIZEOF_INT + !!(SIZEOF_VOIDP % SIZEOF_INT))
59 int intv[CTX_ADDR_LEN];
61 #if (CTX_ADDR_LEN == 1)
62 # define CTX_ADDR_SPLIT(u) (u).intv[0]
63 #elif (CTX_ADDR_LEN == 2)
64 # define CTX_ADDR_SPLIT(u) (u).intv[0], (u).intv[1]
66 # error Your architecture is not supported yet
69 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
71 smx_ctx_base_factory_init(factory);
72 XBT_VERB("Activating SYSV context factory");
74 (*factory)->finalize = smx_ctx_sysv_factory_finalize;
75 (*factory)->create_context = smx_ctx_sysv_create_context;
76 /* Do not overload that method (*factory)->finalize */
77 (*factory)->free = smx_ctx_sysv_free;
78 (*factory)->name = "smx_sysv_context_factory";
80 if (SIMIX_context_is_parallel()) {
81 #ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
82 int nthreads = SIMIX_context_get_nthreads();
83 parmap = xbt_parmap_new(nthreads);
84 smx_ctx_sysv_local_maestro_uc = xbt_new(ucontext_t, nthreads);
85 (*factory)->stop = smx_ctx_sysv_stop_parallel;
86 (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
87 (*factory)->runall = smx_ctx_sysv_runall_parallel;
88 (*factory)->self = smx_ctx_sysv_self_parallel;
90 THROWF(arg_error, 0, "No thread support for parallel context execution");
93 (*factory)->stop = smx_ctx_sysv_stop_serial;
94 (*factory)->suspend = smx_ctx_sysv_suspend_serial;
95 (*factory)->runall = smx_ctx_sysv_runall_serial;
99 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
101 #ifdef CONTEXT_THREADS
103 xbt_parmap_destroy(parmap);
104 xbt_free(smx_ctx_sysv_local_maestro_uc);
106 return smx_ctx_base_factory_finalize(factory);
110 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
111 int argc, char **argv,
112 void_pfn_smxprocess_t cleanup_func,
115 union u_ctx_addr ctx_addr;
116 smx_ctx_sysv_t context =
117 (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
124 /* if the user provided a function for the process then use it,
125 otherwise it is the context for maestro */
128 int res = getcontext(&(context->uc));
130 "Error in context saving: %d (%s)", errno,
133 context->uc.uc_link = NULL;
135 context->uc.uc_stack.ss_sp =
136 pth_skaddr_makecontext(context->stack, smx_context_stack_size);
138 context->uc.uc_stack.ss_size =
139 pth_sksize_makecontext(context->stack, smx_context_stack_size);
141 #ifdef HAVE_VALGRIND_VALGRIND_H
142 context->valgrind_stack_id =
143 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
144 ((char *) context->uc.uc_stack.ss_sp) +
145 context->uc.uc_stack.ss_size);
146 #endif /* HAVE_VALGRIND_VALGRIND_H */
147 ctx_addr.addr = context;
148 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
149 CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
151 smx_ctx_sysv_maestro_context = context;
154 return (smx_context_t) context;
158 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
159 void_pfn_smxprocess_t cleanup_func,
163 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
164 code, argc, argv, cleanup_func,
169 void smx_ctx_sysv_free(smx_context_t context)
174 #ifdef HAVE_VALGRIND_VALGRIND_H
175 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
176 context)->valgrind_stack_id);
177 #endif /* HAVE_VALGRIND_VALGRIND_H */
180 smx_ctx_base_free(context);
183 void smx_ctx_sysv_wrapper(int first, ...)
185 union u_ctx_addr ctx_addr;
186 smx_ctx_sysv_t context;
188 ctx_addr.intv[0] = first;
189 if (CTX_ADDR_LEN > 1) {
193 for (i = 1; i < CTX_ADDR_LEN; i++)
194 ctx_addr.intv[i] = va_arg(ap, int);
197 context = ctx_addr.addr;
198 (context->super.code) (context->super.argc, context->super.argv);
200 simix_global->context_factory->stop((smx_context_t) context);
203 static void smx_ctx_sysv_stop_serial(smx_context_t context)
205 smx_ctx_base_stop(context);
206 smx_ctx_sysv_suspend_serial(context);
209 static void smx_ctx_sysv_suspend_serial(smx_context_t context)
211 /* determine the next context */
212 smx_context_t next_context;
213 unsigned long int i = smx_ctx_sysv_process_index++;
215 if (i < xbt_dynar_length(simix_global->process_to_run)) {
216 /* execute the next process */
217 XBT_DEBUG("Run next process");
218 next_context = xbt_dynar_get_as(
219 simix_global->process_to_run,i, smx_process_t)->context;
222 /* all processes were run, return to maestro */
223 XBT_DEBUG("No more process to run");
224 next_context = (smx_context_t) smx_ctx_sysv_maestro_context;
226 SIMIX_context_set_current(next_context);
227 swapcontext(&((smx_ctx_sysv_t) context)->uc,
228 &((smx_ctx_sysv_t) next_context)->uc);
231 static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
233 smx_context_t context = first_process->context;
234 SIMIX_context_set_current(context);
235 swapcontext(&smx_ctx_sysv_maestro_context->uc,
236 &((smx_ctx_sysv_t) context)->uc);
239 static void smx_ctx_sysv_runall_serial(void)
241 if (xbt_dynar_length(simix_global->process_to_run) > 0) {
242 smx_process_t first_process =
243 xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
244 smx_ctx_sysv_process_index = 1;
246 /* execute the first process */
247 smx_ctx_sysv_resume_serial(first_process);
251 static void smx_ctx_sysv_stop_parallel(smx_context_t context)
253 smx_ctx_base_stop(context);
254 smx_ctx_sysv_suspend_parallel(context);
257 static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
259 #ifdef CONTEXT_THREADS
260 /* determine the next context */
261 smx_process_t next_work = xbt_parmap_next(parmap);
262 smx_context_t next_context;
265 if (next_work != NULL) {
266 /* there is a next process to resume */
267 XBT_DEBUG("Run next process");
268 next_context = next_work->context;
269 next_uc = &((smx_ctx_sysv_t) next_context)->uc;
272 /* all processes were run, go to the barrier */
273 XBT_DEBUG("No more processes to run");
274 next_context = (smx_context_t) smx_ctx_sysv_maestro_context;
275 unsigned long worker_id = (unsigned long) xbt_os_thread_get_extra_data();
276 next_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
279 SIMIX_context_set_current(next_context);
280 swapcontext(&((smx_ctx_sysv_t) context)->uc, next_uc);
284 static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
286 #ifdef CONTEXT_THREADS
287 unsigned long worker_id = (unsigned long) xbt_os_thread_get_extra_data();
288 ucontext_t* local_maestro_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
290 smx_context_t context = first_process->context;
291 SIMIX_context_set_current(context);
292 swapcontext(local_maestro_uc, &((smx_ctx_sysv_t) context)->uc);
296 static void smx_ctx_sysv_runall_parallel(void)
298 #ifdef CONTEXT_THREADS
299 xbt_parmap_apply(parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
300 simix_global->process_to_run);
304 smx_context_t smx_ctx_sysv_self_parallel(void)
306 /*smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
307 return self_context ? self_context : (smx_context_t) maestro_context;*/
308 return SIMIX_context_get_current();