-/* $Id$ */
+/* context_sysv - context switching with ucontextes from System V */
-/* context_sysv - implementation of context switching with ucontextes from Sys V */
+/* Copyright (c) 2009, 2010. The SimGrid Team.
+ * All rights reserved. */
-/* Copyright (c) 2004-2008 the SimGrid team. All right reserved */
+ /* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
+#include <stdarg.h>
-#include "private.h"
-#include "context_sysv_config.h" /* loads context system definitions */
-#include "portable.h"
-#include <ucontext.h> /* context relative declarations */
-
-/* lower this if you want to reduce the memory consumption */
-#define STACK_SIZE 128*1024
+#include "smx_context_sysv_private.h"
+#include "xbt/parmap.h"
+#include "simix/private.h"
+#include "gras_config.h"
#ifdef HAVE_VALGRIND_VALGRIND_H
# include <valgrind/valgrind.h>
-#endif /* HAVE_VALGRIND_VALGRIND_H */
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-typedef struct s_smx_ctx_sysv {
- SMX_CTX_BASE_T;
- ucontext_t uc; /* the thread that execute the code */
- char stack[STACK_SIZE]; /* the thread stack size */
-#ifdef HAVE_VALGRIND_VALGRIND_H
- unsigned int valgrind_stack_id; /* the valgrind stack id */
-#endif
-} s_smx_ctx_sysv_t, *smx_ctx_sysv_t;
+#endif /* HAVE_VALGRIND_VALGRIND_H */
-static smx_context_t
-smx_ctx_sysv_factory_create_context(xbt_main_func_t code, int argc, char** argv,
- void_f_pvoid_t cleanup_func, void* cleanup_arg);
+#ifdef _XBT_WIN32
+#include "win32_ucontext.h"
+#else
+#include "ucontext.h"
+#endif
-static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
-
-static void smx_ctx_sysv_free(smx_context_t context);
-static void smx_ctx_sysv_stop(smx_context_t context);
-static void smx_ctx_sysv_suspend(smx_context_t context);
-static void smx_ctx_sysv_resume(smx_context_t new_context);
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-static void smx_ctx_sysv_wrapper(void);
+#ifdef CONTEXT_THREADS
+static xbt_parmap_t smx_ctx_sysv_parmap;
+static ucontext_t* smx_ctx_sysv_local_maestro_uc; /* space to save maestro's stack in each thread */
+#endif
+static unsigned long smx_ctx_sysv_process_index = 0; /* index of the next process to run in the
+ * list of runnable processes */
+static smx_ctx_sysv_t smx_ctx_sysv_maestro_context;
+
+
+static smx_context_t
+smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func, void* data);
+
+static void smx_ctx_sysv_wrapper(int count, ...);
+
+static void smx_ctx_sysv_stop_serial(smx_context_t context);
+static void smx_ctx_sysv_suspend_serial(smx_context_t context);
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process);
+static void smx_ctx_sysv_runall_serial(void);
+
+static void smx_ctx_sysv_stop_parallel(smx_context_t context);
+static void smx_ctx_sysv_suspend_parallel(smx_context_t context);
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process);
+static void smx_ctx_sysv_runall_parallel(void);
+
+
+/* This is a bit paranoid about SIZEOF_VOIDP not being a multiple of SIZEOF_INT,
+ * but it doesn't harm. */
+#define CTX_ADDR_LEN (SIZEOF_VOIDP / SIZEOF_INT + !!(SIZEOF_VOIDP % SIZEOF_INT))
+union u_ctx_addr {
+ void *addr;
+ int intv[CTX_ADDR_LEN];
+};
+#if (CTX_ADDR_LEN == 1)
+# define CTX_ADDR_SPLIT(u) (u).intv[0]
+#elif (CTX_ADDR_LEN == 2)
+# define CTX_ADDR_SPLIT(u) (u).intv[0], (u).intv[1]
+#else
+# error Your architecture is not supported yet
+#endif
void SIMIX_ctx_sysv_factory_init(smx_context_factory_t *factory)
{
- *factory = xbt_new0(s_smx_context_factory_t, 1);
+ smx_ctx_base_factory_init(factory);
+ XBT_VERB("Activating SYSV context factory");
- (*factory)->create_context = smx_ctx_sysv_factory_create_context;
(*factory)->finalize = smx_ctx_sysv_factory_finalize;
+ (*factory)->create_context = smx_ctx_sysv_create_context;
+ /* Do not overload that method (*factory)->finalize */
(*factory)->free = smx_ctx_sysv_free;
- (*factory)->stop = smx_ctx_sysv_stop;
- (*factory)->suspend = smx_ctx_sysv_suspend;
- (*factory)->resume = smx_ctx_sysv_resume;
(*factory)->name = "smx_sysv_context_factory";
+
+ if (SIMIX_context_is_parallel()) {
+#ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
+ int nthreads = SIMIX_context_get_nthreads();
+ smx_ctx_sysv_parmap = xbt_parmap_new(nthreads);
+ smx_ctx_sysv_local_maestro_uc = xbt_new(ucontext_t, nthreads);
+ (*factory)->stop = smx_ctx_sysv_stop_parallel;
+ (*factory)->suspend = smx_ctx_sysv_suspend_parallel;
+ (*factory)->runall = smx_ctx_sysv_runall_parallel;
+#else
+ THROWF(arg_error, 0, "No thread support for parallel context execution");
+#endif
+ } else {
+ (*factory)->stop = smx_ctx_sysv_stop_serial;
+ (*factory)->suspend = smx_ctx_sysv_suspend_serial;
+ (*factory)->runall = smx_ctx_sysv_runall_serial;
+ }
}
-static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory)
-{
- free(*factory);
- *factory = NULL;
- return 0;
+int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
+{
+#ifdef CONTEXT_THREADS
+ if (smx_ctx_sysv_parmap)
+ xbt_parmap_destroy(smx_ctx_sysv_parmap);
+ xbt_free(smx_ctx_sysv_local_maestro_uc);
+#endif
+ return smx_ctx_base_factory_finalize(factory);
}
-static smx_context_t
-smx_ctx_sysv_factory_create_context(xbt_main_func_t code, int argc, char** argv,
- void_f_pvoid_t cleanup_func, void* cleanup_arg)
+smx_context_t
+smx_ctx_sysv_create_context_sized(size_t size, xbt_main_func_t code,
+ int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data)
{
- smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1);
+ union u_ctx_addr ctx_addr;
+ smx_ctx_sysv_t context =
+ (smx_ctx_sysv_t) smx_ctx_base_factory_create_context_sized(size,
+ code,
+ argc,
+ argv,
+ cleanup_func,
+ data);
- /* If the user provided a function for the process then use it
- otherwise is the context for maestro */
- if(code){
- context->code = code;
+ /* if the user provided a function for the process then use it,
+ otherwise it is the context for maestro */
+ if (code) {
- xbt_assert2(getcontext(&(context->uc)) == 0,
- "Error in context saving: %d (%s)", errno, strerror(errno));
+ getcontext(&(context->uc));
context->uc.uc_link = NULL;
context->uc.uc_stack.ss_sp =
- pth_skaddr_makecontext(context->stack, STACK_SIZE);
+ pth_skaddr_makecontext(context->stack, smx_context_stack_size);
context->uc.uc_stack.ss_size =
- pth_sksize_makecontext(context->stack, STACK_SIZE);
+ pth_sksize_makecontext(context->stack, smx_context_stack_size);
#ifdef HAVE_VALGRIND_VALGRIND_H
context->valgrind_stack_id =
VALGRIND_STACK_REGISTER(context->uc.uc_stack.ss_sp,
- ((char *) context->uc.uc_stack.ss_sp) +
- context->uc.uc_stack.ss_size);
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+ ((char *) context->uc.uc_stack.ss_sp) +
+ context->uc.uc_stack.ss_size);
+#endif /* HAVE_VALGRIND_VALGRIND_H */
+ ctx_addr.addr = context;
+ makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
+ CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
+ } else {
+ smx_ctx_sysv_maestro_context = context;
+ }
- context->argc = argc;
- context->argv = argv;
- context->cleanup_func = cleanup_func;
- context->cleanup_arg = cleanup_arg;
+ return (smx_context_t) context;
+}
- makecontext(&((smx_ctx_sysv_t)context)->uc, smx_ctx_sysv_wrapper, 0);
- }
+static smx_context_t
+smx_ctx_sysv_create_context(xbt_main_func_t code, int argc, char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data)
+{
+
+ return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
+ code, argc, argv, cleanup_func,
+ data);
- return (smx_context_t)context;
}
-static void smx_ctx_sysv_free(smx_context_t pcontext)
+void smx_ctx_sysv_free(smx_context_t context)
{
- int i;
- smx_ctx_sysv_t context = (smx_ctx_sysv_t)pcontext;
- if (context){
-#ifdef HAVE_VALGRIND_VALGRIND_H
- VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id);
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+ if (context) {
- /* free argv */
- if (context->argv) {
- for (i = 0; i < context->argc; i++)
- if (context->argv[i])
- free(context->argv[i]);
+#ifdef HAVE_VALGRIND_VALGRIND_H
+ VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
+ context)->valgrind_stack_id);
+#endif /* HAVE_VALGRIND_VALGRIND_H */
- free(context->argv);
- }
+ }
+ smx_ctx_base_free(context);
+}
- /* destroy the context */
- free(context);
+void smx_ctx_sysv_wrapper(int first, ...)
+{
+ union u_ctx_addr ctx_addr;
+ smx_ctx_sysv_t context;
+
+ ctx_addr.intv[0] = first;
+ if (CTX_ADDR_LEN > 1) {
+ va_list ap;
+ int i;
+ va_start(ap, first);
+ for (i = 1; i < CTX_ADDR_LEN; i++)
+ ctx_addr.intv[i] = va_arg(ap, int);
+ va_end(ap);
}
+ context = ctx_addr.addr;
+ (context->super.code) (context->super.argc, context->super.argv);
+
+ simix_global->context_factory->stop((smx_context_t) context);
}
-static void smx_ctx_sysv_stop(smx_context_t pcontext)
+static void smx_ctx_sysv_stop_serial(smx_context_t context)
{
- smx_ctx_sysv_t context = (smx_ctx_sysv_t)pcontext;
-
- if (context->cleanup_func)
- (*context->cleanup_func) (context->cleanup_arg);
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_serial(context);
+}
- smx_ctx_sysv_suspend(pcontext);
+static void smx_ctx_sysv_suspend_serial(smx_context_t context)
+{
+ /* determine the next context */
+ smx_context_t next_context;
+ unsigned long int i = smx_ctx_sysv_process_index++;
+
+ if (i < xbt_dynar_length(simix_global->process_to_run)) {
+ /* execute the next process */
+ XBT_DEBUG("Run next process");
+ next_context = xbt_dynar_get_as(
+ simix_global->process_to_run,i, smx_process_t)->context;
+ }
+ else {
+ /* all processes were run, return to maestro */
+ XBT_DEBUG("No more process to run");
+ next_context = (smx_context_t) smx_ctx_sysv_maestro_context;
+ }
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc,
+ &((smx_ctx_sysv_t) next_context)->uc);
}
-static void smx_ctx_sysv_wrapper()
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
{
- /*FIXME: I would like to avoid accessing simix_global to get the current
- context by passing it as an argument of the wrapper function. The problem
- is that this function is called from smx_ctx_sysv_start, and uses
- makecontext for calling it, and the stupid posix specification states that
- all the arguments of the function should be int(32 bits), making it useless
- in 64-bit architectures where pointers are 64 bit long.
- */
- smx_ctx_sysv_t context =
- (smx_ctx_sysv_t)simix_global->current_process->context;
-
- (context->code) (context->argc, context->argv);
-
- smx_ctx_sysv_stop((smx_context_t)context);
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(&smx_ctx_sysv_maestro_context->uc,
+ &((smx_ctx_sysv_t) context)->uc);
}
-static void smx_ctx_sysv_suspend(smx_context_t context) {
- int rv;
- ucontext_t maestro_ctx = ((smx_ctx_sysv_t)simix_global->maestro_process->context)->uc;
+static void smx_ctx_sysv_runall_serial(void)
+{
+ if (!xbt_dynar_is_empty(simix_global->process_to_run)) {
+ smx_process_t first_process =
+ xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
+ smx_ctx_sysv_process_index = 1;
- rv = swapcontext(&((smx_ctx_sysv_t) context)->uc, &maestro_ctx);
+ /* execute the first process */
+ smx_ctx_sysv_resume_serial(first_process);
+ }
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_stop_parallel(smx_context_t context)
+{
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_parallel(context);
}
-static void
-smx_ctx_sysv_resume(smx_context_t new_context) {
- int rv;
- smx_ctx_sysv_t maestro = (smx_ctx_sysv_t)simix_global->maestro_process->context;
+static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
+{
+#ifdef CONTEXT_THREADS
+ /* determine the next context */
+ smx_process_t next_work = xbt_parmap_next(smx_ctx_sysv_parmap);
+ smx_context_t next_context;
+ ucontext_t* next_uc;
+
+ if (next_work != NULL) {
+ /* there is a next process to resume */
+ XBT_DEBUG("Run next process");
+ next_context = next_work->context;
+ next_uc = &((smx_ctx_sysv_t) next_context)->uc;
+ }
+ else {
+ /* all processes were run, go to the barrier */
+ XBT_DEBUG("No more processes to run");
+ next_context = (smx_context_t) smx_ctx_sysv_maestro_context;
+ unsigned long worker_id = xbt_parmap_get_worker_id(smx_ctx_sysv_parmap);
+ next_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
+ }
- rv = swapcontext(&(maestro->uc), &((smx_ctx_sysv_t)new_context)->uc);
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc, next_uc);
+#endif
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
+{
+#ifdef CONTEXT_THREADS
+ unsigned long worker_id = xbt_parmap_get_worker_id(smx_ctx_sysv_parmap);
+ ucontext_t* local_maestro_uc = &smx_ctx_sysv_local_maestro_uc[worker_id];
+
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(local_maestro_uc, &((smx_ctx_sysv_t) context)->uc);
+#endif
+}
+
+static void smx_ctx_sysv_runall_parallel(void)
+{
+#ifdef CONTEXT_THREADS
+ xbt_parmap_apply(smx_ctx_sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
+ simix_global->process_to_run);
+#endif
}
