/* 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 <cerrno>
+#include <cstring>
+
#include <utility>
#include <string>
#include <xbt/config.hpp>
+#include <xbt/log.h>
#include <xbt/range.hpp>
+#include <xbt/sysdep.h>
#include "src/internal_config.h"
#include "xbt/log.h"
#include "xbt/swag.h"
#include "xbt/xbt_os_thread.h"
#include "smx_private.h"
-#include "smx_private.hpp"
#include "simgrid/sg_config.h"
#include "src/internal_config.h"
#include "simgrid/modelchecker.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mechanism");
-static std::pair<const char*, simgrid::simix::ContextFactoryInitializer> context_factories[] = {
+static std::pair<const char*, simgrid::kernel::context::ContextFactoryInitializer> context_factories[] = {
#if HAVE_RAW_CONTEXTS
- { "raw", simgrid::simix::raw_factory },
+ { "raw", &simgrid::kernel::context::raw_factory },
#endif
#if HAVE_UCONTEXT_CONTEXTS
- { "ucontext", simgrid::simix::sysv_factory },
+ { "ucontext", &simgrid::kernel::context::sysv_factory },
#endif
#if HAVE_BOOST_CONTEXTS
- { "boost", simgrid::simix::boost_factory },
+ { "boost", &simgrid::kernel::context::boost_factory },
#endif
#if HAVE_THREAD_CONTEXTS
- { "thread", simgrid::simix::thread_factory },
+ { "thread", &simgrid::kernel::context::thread_factory },
#endif
};
-static_assert(sizeof(context_factories) != 0,
- "No context factories are enabled for this build");
+static_assert(sizeof(context_factories) != 0, "No context factories are enabled for this build");
// Create the list of possible contexts:
static inline
static int smx_parallel_threshold = 2;
static e_xbt_parmap_mode_t smx_parallel_synchronization_mode = XBT_PARMAP_DEFAULT;
-static inline
-void invalid_context_factory()
-{
- XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
-#if HAVE_RAW_CONTEXTS
- XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid");
-#else
- XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)");
-#endif
-#if HAVE_UCONTEXT_CONTEXTS
- XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)");
-#else
- XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)");
-#endif
-#if HAVE_BOOST_CONTEXTS
- XBT_ERROR(" boost: this uses the boost libraries context implementation");
-#else
- XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)");
-#endif
- XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc");
- xbt_die("Please use a valid factory.");
-}
-
/**
* This function is called by SIMIX_global_init() to initialize the context module.
*/
-void SIMIX_context_mod_init(void)
+void SIMIX_context_mod_init()
{
+ xbt_assert(simix_global->context_factory == nullptr);
+
#if HAVE_THREAD_CONTEXTS && !HAVE_THREAD_LOCAL_STORAGE
/* the __thread storage class is not available on this platform:
* use getspecific/setspecific instead to store the current context in each thread */
xbt_os_thread_key_create(&smx_current_context_key);
#endif
- if (simix_global->context_factory)
- return;
+
/* select the context factory to use to create the contexts */
- if (simgrid::simix::factory_initializer) { // Give Java a chance to hijack the factory mechanism
- simix_global->context_factory = simgrid::simix::factory_initializer();
+ if (simgrid::kernel::context::factory_initializer) { // Give Java a chance to hijack the factory mechanism
+ simix_global->context_factory = simgrid::kernel::context::factory_initializer();
return;
}
/* use the factory specified by --cfg=contexts/factory:value */
simix_global->context_factory = factory.second();
break;
}
- if (simix_global->context_factory == nullptr)
- invalid_context_factory();
+
+ if (simix_global->context_factory == nullptr) {
+ XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
+#if HAVE_RAW_CONTEXTS
+ XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid");
+#else
+ XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)");
+#endif
+#if HAVE_UCONTEXT_CONTEXTS
+ XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)");
+#else
+ XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)");
+#endif
+#if HAVE_BOOST_CONTEXTS
+ XBT_ERROR(" boost: this uses the boost libraries context implementation");
+#else
+ XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you install the libboost-context-dev package?)");
+#endif
+ XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc");
+ xbt_die("Please use a valid factory.");
+ }
}
/**
* This function is called by SIMIX_clean() to finalize the context module.
*/
-void SIMIX_context_mod_exit(void)
+void SIMIX_context_mod_exit()
{
delete simix_global->context_factory;
simix_global->context_factory = nullptr;
}
-void *SIMIX_context_stack_new(void)
+void *SIMIX_context_stack_new()
{
void *stack;
#ifndef _WIN32
if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) {
- xbt_die("Failed to protect stack: %s", strerror(errno));
- /* This is fatal. We are going to fail at some point when
- we tryi reusing this. */
+ xbt_die(
+ "Failed to protect stack: %s.\n"
+ "If you are running a lot of actors, you may be exceeding the amount of mappings allowed per process.\n"
+ "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n"
+ "Please see http://simgrid.gforge.inria.fr/simgrid/latest/doc/html/options.html#options_virt for more info.",
+ strerror(errno));
+ /* This is fatal. We are going to fail at some point when we try reusing this. */
}
#endif
stack = (char *)stack + smx_context_guard_size;
}
/** @brief Returns whether some parallel threads are used for the user contexts. */
-int SIMIX_context_is_parallel(void) {
+int SIMIX_context_is_parallel() {
return smx_parallel_contexts > 1;
}
/**
- * \brief Returns the number of parallel threads used
- * for the user contexts.
+ * @brief Returns the number of parallel threads used for the user contexts.
* \return the number of threads (1 means no parallelism)
*/
-int SIMIX_context_get_nthreads(void) {
+int SIMIX_context_get_nthreads() {
return smx_parallel_contexts;
}
* \return when the number of user processes ready to run is above
* this threshold, they are run in parallel
*/
-int SIMIX_context_get_parallel_threshold(void) {
+int SIMIX_context_get_parallel_threshold() {
return smx_parallel_threshold;
}
* parallel.
* \return how threads are synchronized if processes are run in parallel
*/
-e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode(void) {
+e_xbt_parmap_mode_t SIMIX_context_get_parallel_mode() {
return smx_parallel_synchronization_mode;
}
* \brief Returns the current context of this thread.
* \return the current context of this thread
*/
-smx_context_t SIMIX_context_get_current(void)
+smx_context_t SIMIX_context_get_current()
{
if (SIMIX_context_is_parallel()) {
#if HAVE_THREAD_LOCAL_STORAGE
