-/* $Id$ */
+/* 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 "xbt/ex_interface.h"
-#include "private.h"
+#include "xbt/parmap.h"
+#include "simix/private.h"
+#include "gras_config.h"
+#include "context_sysv_config.h" /* loads context system definitions */
+
+#ifdef _XBT_WIN32
+# include <win32_ucontext.h> /* context relative declarations */
+#else
+# include <ucontext.h> /* context relative declarations */
+#endif
-#include "context_sysv_config.h" /* loads context system definitions */
-#include "portable.h"
-#include <ucontext.h> /* context relative declarations */
-#define STACK_SIZE 128*1024 /* lower this if you want to reduce the memory consumption */
#ifdef HAVE_VALGRIND_VALGRIND_H
# include <valgrind/valgrind.h>
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+#endif /* HAVE_VALGRIND_VALGRIND_H */
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(smx_context);
+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 */
- smx_process_t prev; /* the previous process */
+ s_smx_ctx_base_t super; /* Fields of super implementation */
+ ucontext_t uc; /* the ucontext that executes the code */
#ifdef HAVE_VALGRIND_VALGRIND_H
unsigned int valgrind_stack_id; /* the valgrind stack id */
-#endif
+#endif
+ char stack[0]; /* the thread stack (must remain the last element of the structure) */
} s_smx_ctx_sysv_t, *smx_ctx_sysv_t;
+#ifdef CONTEXT_THREADS
+static xbt_parmap_t sysv_parmap;
+static ucontext_t* sysv_workers_stacks; /* space to save the worker's stack in each thread */
+static unsigned long sysv_threads_working; /* number of threads that have started their work */
+static xbt_os_thread_key_t sysv_worker_id_key; /* thread-specific storage for the thread id */
+#endif
+static unsigned long sysv_process_index = 0; /* index of the next process to run in the
+ * list of runnable processes */
+static smx_ctx_sysv_t sysv_maestro_context;
+
+static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory);
+static smx_context_t
+smx_ctx_sysv_create_context_sized(size_t structure_size,
+ xbt_main_func_t code, int argc,
+ char **argv,
+ void_pfn_smxprocess_t cleanup_func,
+ void *data);
+static void smx_ctx_sysv_free(smx_context_t context);
+static smx_context_t smx_ctx_sysv_self_parallel(void);
+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)
+{
+ smx_ctx_base_factory_init(factory);
+ XBT_VERB("Activating SYSV context factory");
-/* callback: context fetching */
-static ex_ctx_t *xbt_jcontext_ex_ctx(void);
-
-/* callback: termination */
-static void xbt_jcontext_ex_terminate(xbt_ex_t * e);
-
-static int
-smx_ctx_sysv_factory_create_context(smx_process_t *smx_process, xbt_main_func_t code);
-
-static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory);
-
-static int smx_ctx_sysv_factory_create_maestro_context(smx_process_t * maestro);
-
-static void smx_ctx_sysv_free(smx_process_t process);
-
-static void smx_ctx_sysv_kill(smx_process_t process);
-
-static void smx_ctx_sysv_schedule(smx_process_t process);
-
-static void smx_ctx_sysv_yield(void);
-
-static void smx_ctx_sysv_start(smx_process_t process);
-
-static void smx_ctx_sysv_stop(int exit_code);
-
-static void smx_ctx_sysv_swap(smx_process_t process);
-
-static void smx_ctx_sysv_schedule(smx_process_t process);
-
-static void smx_ctx_sysv_yield(void);
-
-static void smx_ctx_sysv_suspend(smx_process_t process);
-
-static void smx_ctx_sysv_resume(smx_process_t process);
-
-static void smx_ctx_sysv_wrapper(void);
+ (*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)->name = "smx_sysv_context_factory";
-/* callback: context fetching */
-static ex_ctx_t *xbt_ctx_sysv_ex_ctx(void)
-{
- return simix_global->current_process->context->exception;
+ if (SIMIX_context_is_parallel()) {
+#ifdef CONTEXT_THREADS /* To use parallel ucontexts a thread pool is needed */
+ int nthreads = SIMIX_context_get_nthreads();
+ sysv_parmap = xbt_parmap_new(nthreads, SIMIX_context_get_parallel_mode());
+ sysv_workers_stacks = xbt_new(ucontext_t, nthreads);
+ xbt_os_thread_key_create(&sysv_worker_id_key);
+ (*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;
+ }
}
-/* callback: termination */
-static void xbt_ctx_sysv_ex_terminate(xbt_ex_t * e)
-{
- xbt_ex_display(e);
- abort();
+static int smx_ctx_sysv_factory_finalize(smx_context_factory_t *factory)
+{
+#ifdef CONTEXT_THREADS
+ if (sysv_parmap)
+ xbt_parmap_destroy(sysv_parmap);
+ xbt_free(sysv_workers_stacks);
+#endif
+ return smx_ctx_base_factory_finalize(factory);
}
-void SIMIX_ctx_sysv_factory_init(smx_context_factory_t * factory)
+static 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)
{
- *factory = xbt_new0(s_smx_context_factory_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);
- (*factory)->create_context = smx_ctx_sysv_factory_create_context;
- (*factory)->finalize = smx_ctx_sysv_factory_finalize;
- (*factory)->create_maestro_context = smx_ctx_sysv_factory_create_maestro_context;
- (*factory)->free = smx_ctx_sysv_free;
- (*factory)->kill = smx_ctx_sysv_kill;
- (*factory)->schedule = smx_ctx_sysv_schedule;
- (*factory)->yield = smx_ctx_sysv_yield;
- (*factory)->start = smx_ctx_sysv_start;
- (*factory)->stop = smx_ctx_sysv_stop;
- (*factory)->name = "smx_sysv_context_factory";
+ /* if the user provided a function for the process then use it,
+ otherwise it is the context for maestro */
+ if (code) {
- /* context exception handlers */
- __xbt_ex_ctx = xbt_ctx_sysv_ex_ctx;
- __xbt_ex_terminate = xbt_ctx_sysv_ex_terminate;
-}
+ getcontext(&(context->uc));
-static int smx_ctx_sysv_factory_create_maestro_context(smx_process_t *maestro)
-{
- smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1);
+ context->uc.uc_link = NULL;
- context->exception = xbt_new(ex_ctx_t, 1);
- XBT_CTX_INITIALIZE(context->exception);
+ context->uc.uc_stack.ss_sp =
+ pth_skaddr_makecontext(context->stack, smx_context_stack_size);
- (*maestro)->context = (smx_context_t) context;
+ context->uc.uc_stack.ss_size =
+ pth_sksize_makecontext(context->stack, smx_context_stack_size);
- return 0;
+#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 */
+ ctx_addr.addr = context;
+ makecontext(&context->uc, (void (*)())smx_ctx_sysv_wrapper,
+ CTX_ADDR_LEN, CTX_ADDR_SPLIT(ctx_addr));
+ } else {
+ sysv_maestro_context = context;
+ }
+ return (smx_context_t) context;
}
-static int smx_ctx_sysv_factory_finalize(smx_context_factory_t * factory)
+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)
{
- /*FIXME free(maestro_context->exception);*/
- free(*factory);
- *factory = NULL;
- return 0;
-}
-static int
-smx_ctx_sysv_factory_create_context(smx_process_t *smx_process, xbt_main_func_t code)
-{
- VERB1("Create context %s", (*smx_process)->name);
- smx_ctx_sysv_t context = xbt_new0(s_smx_ctx_sysv_t, 1);
-
- context->code = code;
-
- xbt_assert2(getcontext(&(context->uc)) == 0,
- "Error in context saving: %d (%s)", errno, strerror(errno));
- context->uc.uc_link = NULL;
- context->uc.uc_stack.ss_sp =
- pth_skaddr_makecontext(context->stack, STACK_SIZE);
- context->uc.uc_stack.ss_size =
- pth_sksize_makecontext(context->stack, 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 */
-
- context->exception = xbt_new(ex_ctx_t, 1);
- XBT_CTX_INITIALIZE(context->exception);
- (*smx_process)->context = (smx_context_t)context;
- (*smx_process)->iwannadie = 0;
-
- /* FIXME: Check what should return */
- return 1;
+ return smx_ctx_sysv_create_context_sized(sizeof(s_smx_ctx_sysv_t) + smx_context_stack_size,
+ code, argc, argv, cleanup_func,
+ data);
+
}
-static void smx_ctx_sysv_free(smx_process_t process)
+static void smx_ctx_sysv_free(smx_context_t context)
{
- smx_ctx_sysv_t context = (smx_ctx_sysv_t)process->context;
- if (context){
- if (context->exception)
- free(context->exception);
+ if (context) {
#ifdef HAVE_VALGRIND_VALGRIND_H
- VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t) context)->valgrind_stack_id);
-#endif /* HAVE_VALGRIND_VALGRIND_H */
+ VALGRIND_STACK_DEREGISTER(((smx_ctx_sysv_t)
+ context)->valgrind_stack_id);
+#endif /* HAVE_VALGRIND_VALGRIND_H */
- /* destroy the context */
- free(context);
}
+ smx_ctx_base_free(context);
}
-static void smx_ctx_sysv_kill(smx_process_t process)
-{
- DEBUG2("Kill process '%s' (from '%s')", process->name,
- simix_global->current_process->name);
- process->iwannadie = 1;
- smx_ctx_sysv_swap(process);
-}
+static 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);
-/**
- * \param context the winner
- *
- * Calling this function blocks the current context and schedule \a context.
- * When \a context will call xbt_context_yield, it will return
- * to this function as if nothing had happened.
- *
- * Only the maestro can call this function to run a given process.
- */
-static void smx_ctx_sysv_schedule(smx_process_t process)
-{
- DEBUG1("Schedule process '%s'", process->name);
- xbt_assert0((simix_global->current_process == simix_global->maestro_process),
- "You are not supposed to run this function here!");
- smx_ctx_sysv_swap(process);
+ simix_global->context_factory->stop((smx_context_t) context);
}
-/**
- * Calling this function makes the current context yield. The context
- * that scheduled it returns from xbt_context_schedule as if nothing
- * had happened.
- *
- * Only the processes can call this function, giving back the control
- * to the maestro
- */
-static void smx_ctx_sysv_yield(void)
+static void smx_ctx_sysv_stop_serial(smx_context_t context)
{
- DEBUG1("Yielding process '%s'", simix_global->current_process->name);
- xbt_assert0((simix_global->current_process != simix_global->maestro_process),
- "You are not supposed to run this function here!");
- smx_ctx_sysv_swap(simix_global->current_process);
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_serial(context);
}
-static void smx_ctx_sysv_start(smx_process_t process)
+static void smx_ctx_sysv_suspend_serial(smx_context_t context)
{
- /*DEBUG1("Start context '%s'", context->name);*/
- makecontext(&(((smx_ctx_sysv_t) process->context)->uc), smx_ctx_sysv_wrapper, 0);
+ /* determine the next context */
+ smx_context_t next_context;
+ unsigned long int i = 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) 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_stop(int exit_code)
+static void smx_ctx_sysv_resume_serial(smx_process_t first_process)
{
- /* please no debug here: our procdata was already free'd */
- if (simix_global->current_process->cleanup_func)
- ((*simix_global->current_process->cleanup_func)) (simix_global->current_process->cleanup_arg);
-
- smx_ctx_sysv_swap(simix_global->current_process);
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(&sysv_maestro_context->uc,
+ &((smx_ctx_sysv_t) context)->uc);
}
-static void smx_ctx_sysv_swap(smx_process_t process)
+static void smx_ctx_sysv_runall_serial(void)
{
- DEBUG2("Swap context: '%s' -> '%s'", simix_global->current_process->name, process->name);
- xbt_assert0(simix_global->current_process, "You have to call context_init() first.");
- xbt_assert0(process, "Invalid argument");
-
- if (((smx_ctx_sysv_t) process->context)->prev == NULL)
- smx_ctx_sysv_resume(process);
- else
- smx_ctx_sysv_suspend(process);
+ 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);
+ sysv_process_index = 1;
- if (simix_global->current_process->iwannadie)
- smx_ctx_sysv_stop(1);
+ /* execute the first process */
+ smx_ctx_sysv_resume_serial(first_process);
+ }
}
-static void smx_ctx_sysv_wrapper(void)
+static void smx_ctx_sysv_stop_parallel(smx_context_t context)
{
- smx_ctx_sysv_stop((*(simix_global->current_process->context->code))
- (simix_global->current_process->argc, simix_global->current_process->argv));
+ smx_ctx_base_stop(context);
+ smx_ctx_sysv_suspend_parallel(context);
}
-static void smx_ctx_sysv_suspend(smx_process_t process)
+static void smx_ctx_sysv_suspend_parallel(smx_context_t context)
{
- int rv;
-
- DEBUG1("Suspend context: '%s'", simix_global->current_process->name);
- smx_process_t prev_process = ((smx_ctx_sysv_t) process->context)->prev;
-
- simix_global->current_process = prev_process;
-
- ((smx_ctx_sysv_t) process->context)->prev = NULL;
-
- rv = swapcontext(&(((smx_ctx_sysv_t) process->context)->uc), &(((smx_ctx_sysv_t)prev_process->context)->uc));
+#ifdef CONTEXT_THREADS
+ /* determine the next context */
+ smx_process_t next_work = xbt_parmap_next(sysv_parmap);
+ smx_context_t next_context;
+ ucontext_t* next_stack;
+
+ if (next_work != NULL) {
+ /* there is a next process to resume */
+ XBT_DEBUG("Run next process");
+ next_context = next_work->context;
+ next_stack = &((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) sysv_maestro_context;
+ unsigned long worker_id =
+ (unsigned long) xbt_os_thread_get_specific(sysv_worker_id_key);
+ next_stack = &sysv_workers_stacks[worker_id];
+ }
- xbt_assert0((rv == 0), "Context swapping failure");
+ SIMIX_context_set_current(next_context);
+ swapcontext(&((smx_ctx_sysv_t) context)->uc, next_stack);
+#endif
}
-static void smx_ctx_sysv_resume(smx_process_t process)
+static void smx_ctx_sysv_resume_parallel(smx_process_t first_process)
{
- int rv;
- smx_ctx_sysv_t new_context = (smx_ctx_sysv_t)process->context;
- smx_ctx_sysv_t prev_context = (smx_ctx_sysv_t)simix_global->current_process->context;
-
- DEBUG2("Resume context: '%s' (from '%s')", process->name,
- simix_global->current_process->name);
-
- ((smx_ctx_sysv_t) process->context)->prev = simix_global->current_process;
-
- simix_global->current_process = process;
-
- rv = swapcontext(&prev_context->uc, &new_context->uc);
+#ifdef CONTEXT_THREADS
+ unsigned long worker_id = __sync_fetch_and_add(&sysv_threads_working, 1);
+ xbt_os_thread_set_specific(sysv_worker_id_key, (void*) worker_id);
+ ucontext_t* worker_stack = &sysv_workers_stacks[worker_id];
+
+ smx_context_t context = first_process->context;
+ SIMIX_context_set_current(context);
+ swapcontext(worker_stack, &((smx_ctx_sysv_t) context)->uc);
+#endif
+}
- xbt_assert0((rv == 0), "Context swapping failure");
+static void smx_ctx_sysv_runall_parallel(void)
+{
+#ifdef CONTEXT_THREADS
+ sysv_threads_working = 0;
+ xbt_parmap_apply(sysv_parmap, (void_f_pvoid_t) smx_ctx_sysv_resume_parallel,
+ simix_global->process_to_run);
+#endif
}
