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"
22 #include "win32_ucontext.c"
27 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
29 static xbt_parmap_t parmap;
32 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
33 void_pfn_smxprocess_t cleanup_func, void* data);
35 static void smx_ctx_sysv_wrapper(int count, ...);
37 /* This is a bit paranoid about SIZEOF_VOIDP not being a multiple of SIZEOF_INT,
38 * but it doesn't harm. */
39 #define CTX_ADDR_LEN (SIZEOF_VOIDP / SIZEOF_INT + !!(SIZEOF_VOIDP % SIZEOF_INT))
42 int intv[CTX_ADDR_LEN];
44 #if (CTX_ADDR_LEN == 1)
45 # define CTX_ADDR_SPLIT(u) (u).intv[0]
46 #elif (CTX_ADDR_LEN == 2)
47 # define CTX_ADDR_SPLIT(u) (u).intv[0], (u).intv[1]
49 # error Your architecture is not supported yet
52 void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
54 smx_ctx_base_factory_init(factory);
55 VERB0("Activating SYSV context factory");
57 (*factory)->finalize = smx_ctx_sysv_factory_finalize;
58 (*factory)->create_context = smx_ctx_sysv_create_context;
59 /* Do not overload that method (*factory)->finalize */
60 (*factory)->free = smx_ctx_sysv_free;
61 (*factory)->stop = smx_ctx_sysv_stop;
62 (*factory)->suspend = smx_ctx_sysv_suspend;
63 (*factory)->name = "smx_sysv_context_factory";
65 if (smx_parallel_contexts) {
66 #ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
67 parmap = xbt_parmap_new(2);
68 (*factory)->runall = smx_ctx_sysv_runall_parallel;
69 (*factory)->self = smx_ctx_sysv_self_parallel;
71 THROW0(arg_error, 0, "No thread support for parallel context execution");
74 (*factory)->runall = smx_ctx_sysv_runall;
78 int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
81 xbt_parmap_destroy(parmap);
82 return smx_ctx_base_factory_finalize(factory);
86 smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
87 int argc, char **argv,
88 void_pfn_smxprocess_t cleanup_func,
91 union u_ctx_addr ctx_addr;
92 smx_ctx_sysv_t context =
93 (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
100 /* If the user provided a function for the process then use it
101 otherwise is the context for maestro */
104 xbt_assert2(getcontext(&(context->uc)) == 0,
105 "Error in context saving: %d (%s)", errno,
108 context->uc.uc_link = NULL;
110 context->uc.uc_stack.ss_sp =
111 pth_skaddr_makecontext(context->stack, smx_context_stack_size);
113 context->uc.uc_stack.ss_size =
114 pth_sksize_makecontext(context->stack, smx_context_stack_size);
116 #ifdef HAVE_VALGRIND_VALGRIND_H
117 context->valgrind_stack_id =
118 VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
119 ((char *) context->uc.uc_stack.ss_sp) +
120 context->uc.uc_stack.ss_size);
121 #endif /* HAVE_VALGRIND_VALGRIND_H */
122 ctx_addr.addr = context;
123 makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
124 CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
126 maestro_context = context;
129 return (smx_context_t) context;
134 smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
135 void_pfn_smxprocess_t cleanup_func,
139 return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
140 code, argc, argv, cleanup_func,
145 void smx_ctx_sysv_free(smx_context_t context)
150 #ifdef HAVE_VALGRIND_VALGRIND_H
151 VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
152 context)->valgrind_stack_id);
153 #endif /* HAVE_VALGRIND_VALGRIND_H */
156 smx_ctx_base_free(context);
159 void smx_ctx_sysv_stop(smx_context_t context)
161 smx_ctx_base_stop(context);
162 smx_ctx_sysv_suspend(context);
165 void smx_ctx_sysv_wrapper(int first, ...)
167 union u_ctx_addr ctx_addr;
168 smx_ctx_sysv_t context;
170 ctx_addr.intv[0] = first;
171 if (CTX_ADDR_LEN > 1) {
175 for(i = 1; i < CTX_ADDR_LEN; i++)
176 ctx_addr.intv[i] = va_arg(ap, int);
179 context = ctx_addr.addr;
180 (context->super.code) (context->super.argc, context->super.argv);
182 smx_ctx_sysv_stop((smx_context_t) context);
185 void smx_ctx_sysv_suspend(smx_context_t context)
187 smx_current_context = (smx_context_t)maestro_context;
188 int rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &((smx_ctx_sysv_t)context)->old_uc);
190 xbt_assert0((rv == 0), "Context swapping failure");
193 void smx_ctx_sysv_resume(smx_context_t context)
195 smx_current_context = context;
196 int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
198 xbt_assert0((rv == 0), "Context swapping failure");
201 void smx_ctx_sysv_runall(xbt_dynar_t processes)
203 smx_process_t process;
206 xbt_dynar_foreach(processes, cursor, process) {
207 DEBUG2("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
208 smx_ctx_sysv_resume(process->context);
210 xbt_dynar_reset(processes);
213 void smx_ctx_sysv_resume_parallel(smx_process_t process)
215 smx_context_t context = process->context;
216 xbt_os_thread_set_extra_data(context);
217 int rv = swapcontext(&((smx_ctx_sysv_t)context)->old_uc, &((smx_ctx_sysv_t) context)->uc);
218 xbt_os_thread_set_extra_data(NULL);
220 xbt_assert0((rv == 0), "Context swapping failure");
223 void smx_ctx_sysv_runall_parallel(xbt_dynar_t processes)
225 xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_sysv_resume_parallel, processes);
226 xbt_dynar_reset(processes);
229 smx_context_t smx_ctx_sysv_self_parallel(void)
231 smx_context_t self_context = (smx_context_t) xbt_os_thread_get_extra_data();
232 return self_context ? self_context : (smx_context_t) maestro_context;