+++ /dev/null
-/* Copyright (c) 2009-2015. The SimGrid Team.
- * All rights 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. */
-
-/** \file RawContext.cpp
- * Fast context switching inspired from SystemV ucontexts.
- *
- * In contrast to System V context, it does not touch the signal mask
- * which avoids making a system call (at least on Linux).
- */
-
-#include <math.h>
-
-#include <utility>
-#include <functional>
-
-#include "src/internal_config.h"
-
-#include "xbt/log.h"
-#include "xbt/parmap.h"
-#include "xbt/dynar.h"
-
-#include "smx_private.h"
-#include "smx_private.hpp"
-#include "mc/mc.h"
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
-
-// ***** Class definitions
-
-namespace simgrid {
-namespace simix {
-
-class RawContext;
-class RawContextFactory;
-
-class RawContext : public Context {
-protected:
- void* stack_ = nullptr;
- /** pointer to top the stack stack */
- void* stack_top_ = nullptr;
-public:
- friend class RawContextFactory;
- RawContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup_func,
- smx_process_t process);
- ~RawContext();
-public:
- static void wrapper(void* arg);
- void stop() override;
- void suspend() override;
- void resume();
-private:
- void suspend_serial();
- void suspend_parallel();
- void resume_serial();
- void resume_parallel();
-};
-
-class RawContextFactory : public ContextFactory {
-public:
- RawContextFactory();
- ~RawContextFactory();
- RawContext* create_context(std::function<void()> code,
- void_pfn_smxprocess_t, smx_process_t process) override;
- void run_all() override;
-private:
- void run_all_adaptative();
- void run_all_serial();
- void run_all_parallel();
-};
-
-ContextFactory* raw_factory()
-{
- XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
- return new RawContextFactory();
-}
-
-}
-}
-
-// ***** Loads of static stuff
-
-#if HAVE_THREAD_CONTEXTS
-static xbt_parmap_t raw_parmap;
-static simgrid::simix::RawContext** raw_workers_context; /* space to save the worker context in each thread */
-static uintptr_t raw_threads_working; /* number of threads that have started their work */
-static xbt_os_thread_key_t raw_worker_id_key; /* thread-specific storage for the thread id */
-#endif
-static unsigned long raw_process_index = 0; /* index of the next process to run in the
- * list of runnable processes */
-static simgrid::simix::RawContext* raw_maestro_context;
-
-static bool raw_context_parallel = false;
-
-// ***** Raw context routines
-
-typedef void (*rawctx_entry_point_t)(void *);
-
-typedef void* raw_stack_t;
-extern "C" raw_stack_t raw_makecontext(void* malloced_stack, int stack_size,
- rawctx_entry_point_t entry_point, void* arg);
-extern "C" void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context);
-
-// TODO, we should handle FP, MMX and the x87 control-word (for x86 and x86_64)
-
-#if SIMGRID_PROCESSOR_x86_64
-__asm__ (
-#if defined(__APPLE__)
- ".text\n"
- ".globl _raw_makecontext\n"
- "_raw_makecontext:\n"
-#elif defined(_WIN32)
- ".text\n"
- ".globl raw_makecontext\n"
- "raw_makecontext:\n"
-#else
- ".text\n"
- ".globl raw_makecontext\n"
- ".type raw_makecontext,@function\n"
- "raw_makecontext:\n"/* Calling convention sets the arguments in rdi, rsi, rdx and rcx, respectively */
-#endif
- " mov %rdi,%rax\n" /* stack */
- " add %rsi,%rax\n" /* size */
- " andq $-16, %rax\n" /* align stack */
- " movq $0, -8(%rax)\n" /* @return for func */
- " mov %rdx,-16(%rax)\n" /* func */
- " mov %rcx,-24(%rax)\n" /* arg/rdi */
- " movq $0, -32(%rax)\n" /* rsi */
- " movq $0, -40(%rax)\n" /* rdx */
- " movq $0, -48(%rax)\n" /* rcx */
- " movq $0, -56(%rax)\n" /* r8 */
- " movq $0, -64(%rax)\n" /* r9 */
- " movq $0, -72(%rax)\n" /* rbp */
- " movq $0, -80(%rax)\n" /* rbx */
- " movq $0, -88(%rax)\n" /* r12 */
- " movq $0, -96(%rax)\n" /* r13 */
- " movq $0, -104(%rax)\n" /* r14 */
- " movq $0, -112(%rax)\n" /* r15 */
- " sub $112,%rax\n"
- " ret\n"
-);
-
-__asm__ (
-#if defined(__APPLE__)
- ".text\n"
- ".globl _raw_swapcontext\n"
- "_raw_swapcontext:\n"
-#elif defined(_WIN32)
- ".text\n"
- ".globl raw_swapcontext\n"
- "raw_swapcontext:\n"
-#else
- ".text\n"
- ".globl raw_swapcontext\n"
- ".type raw_swapcontext,@function\n"
- "raw_swapcontext:\n" /* Calling convention sets the arguments in rdi and rsi, respectively */
-#endif
- " push %rdi\n"
- " push %rsi\n"
- " push %rdx\n"
- " push %rcx\n"
- " push %r8\n"
- " push %r9\n"
- " push %rbp\n"
- " push %rbx\n"
- " push %r12\n"
- " push %r13\n"
- " push %r14\n"
- " push %r15\n"
- " mov %rsp,(%rdi)\n" /* old */
- " mov %rsi,%rsp\n" /* new */
- " pop %r15\n"
- " pop %r14\n"
- " pop %r13\n"
- " pop %r12\n"
- " pop %rbx\n"
- " pop %rbp\n"
- " pop %r9\n"
- " pop %r8\n"
- " pop %rcx\n"
- " pop %rdx\n"
- " pop %rsi\n"
- " pop %rdi\n"
- " ret\n"
-);
-#elif SIMGRID_PROCESSOR_i686
-__asm__ (
-#if defined(__APPLE__) || defined(_WIN32)
- ".text\n"
- ".globl _raw_makecontext\n"
- "_raw_makecontext:\n"
-#else
- ".text\n"
- ".globl raw_makecontext\n"
- ".type raw_makecontext,@function\n"
- "raw_makecontext:\n"
-#endif
- " movl 4(%esp),%eax\n" /* stack */
- " addl 8(%esp),%eax\n" /* size */
- " andl $-16, %eax\n" /* align stack */
- " movl 12(%esp),%ecx\n" /* func */
- " movl 16(%esp),%edx\n" /* arg */
- " movl %edx, -4(%eax)\n"
- " movl $0, -8(%eax)\n" /* @return for func */
- " movl %ecx,-12(%eax)\n"
- " movl $0, -16(%eax)\n" /* ebp */
- " movl $0, -20(%eax)\n" /* ebx */
- " movl $0, -24(%eax)\n" /* esi */
- " movl $0, -28(%eax)\n" /* edi */
- " subl $28,%eax\n"
- " retl\n"
-);
-
-__asm__ (
-#if defined(__APPLE__) || defined(_WIN32)
- ".text\n"
- ".globl _raw_swapcontext\n"
- "_raw_swapcontext:\n"
-#else
- ".text\n"
- ".globl raw_swapcontext\n"
- ".type raw_swapcontext,@function\n"
- "raw_swapcontext:\n"
-#endif
- // Fetch the parameters:
- " movl 4(%esp),%eax\n" /* old (raw_stack_t*) */
- " movl 8(%esp),%edx\n" /* new (raw_stack_t) */
- // Save registers of the current context on the stack:
- " pushl %ebp\n"
- " pushl %ebx\n"
- " pushl %esi\n"
- " pushl %edi\n"
- // Save the current context (stack pointer) in *old:
- " movl %esp,(%eax)\n"
- // Switch to the stack of the new context:
- " movl %edx,%esp\n"
- // Pop the values of the new context:
- " popl %edi\n"
- " popl %esi\n"
- " popl %ebx\n"
- " popl %ebp\n"
- // Return using the return address of the new context:
- " retl\n"
-);
-#else
-
-
-/* If you implement raw contexts for other processors, don't forget to
- update the definition of HAVE_RAW_CONTEXTS in tools/cmake/CompleteInFiles.cmake */
-
-raw_stack_t raw_makecontext(void* malloced_stack, int stack_size,
- rawctx_entry_point_t entry_point, void* arg) {
- THROW_UNIMPLEMENTED;
-}
-
-void raw_swapcontext(raw_stack_t* old, raw_stack_t new_context) {
- THROW_UNIMPLEMENTED;
-}
-
-#endif
-
-// ***** Method definitions
-
-namespace simgrid {
-namespace simix {
-
-RawContextFactory::RawContextFactory()
- : ContextFactory("RawContextFactory")
-{
- raw_context_parallel = SIMIX_context_is_parallel();
- if (raw_context_parallel) {
-#if HAVE_THREAD_CONTEXTS
- int nthreads = SIMIX_context_get_nthreads();
- xbt_os_thread_key_create(&raw_worker_id_key);
- // TODO, lazily init
- raw_parmap = nullptr;
- raw_workers_context = xbt_new(RawContext*, nthreads);
- raw_maestro_context = nullptr;
-#endif
- // TODO, if(SIMIX_context_get_parallel_threshold() > 1) => choose dynamically
- }
-}
-
-RawContextFactory::~RawContextFactory()
-{
-#if HAVE_THREAD_CONTEXTS
- if (raw_parmap)
- xbt_parmap_destroy(raw_parmap);
- xbt_free(raw_workers_context);
-#endif
-}
-
-RawContext* RawContextFactory::create_context(std::function<void()> code,
- void_pfn_smxprocess_t cleanup, smx_process_t process)
-{
- return this->new_context<RawContext>(std::move(code),
- cleanup, process);
-}
-
-void RawContext::wrapper(void* arg)
-{
- RawContext* context = (RawContext*) arg;
- (*context)();
- context->stop();
-}
-
-RawContext::RawContext(std::function<void()> code,
- void_pfn_smxprocess_t cleanup, smx_process_t process)
- : Context(std::move(code), cleanup, process)
-{
- if (has_code()) {
- this->stack_ = SIMIX_context_stack_new();
- this->stack_top_ = raw_makecontext(this->stack_,
- smx_context_usable_stack_size,
- RawContext::wrapper,
- this);
- } else {
- if(process != nullptr && raw_maestro_context == nullptr)
- raw_maestro_context = this;
- if (MC_is_active())
- MC_ignore_heap(
- &raw_maestro_context->stack_top_,
- sizeof(raw_maestro_context->stack_top_));
- }
-}
-
-RawContext::~RawContext()
-{
- SIMIX_context_stack_delete(this->stack_);
-}
-
-void RawContext::stop()
-{
- Context::stop();
- this->suspend();
-}
-
-void RawContextFactory::run_all()
-{
- if (raw_context_parallel)
- run_all_parallel();
- else
- run_all_serial();
-}
-
-void RawContextFactory::run_all_serial()
-{
- smx_process_t first_process =
- xbt_dynar_get_as(simix_global->process_to_run, 0, smx_process_t);
- raw_process_index = 1;
- static_cast<RawContext*>(first_process->context)->resume_serial();
-}
-
-void RawContextFactory::run_all_parallel()
-{
-#if HAVE_THREAD_CONTEXTS
- raw_threads_working = 0;
- if (raw_parmap == nullptr)
- raw_parmap = xbt_parmap_new(
- SIMIX_context_get_nthreads(), SIMIX_context_get_parallel_mode());
- xbt_parmap_apply(raw_parmap,
- [](void* arg) {
- smx_process_t process = static_cast<smx_process_t>(arg);
- RawContext* context = static_cast<RawContext*>(process->context);
- context->resume_parallel();
- },
- simix_global->process_to_run);
-#else
- xbt_die("You asked for a parallel execution, but you don't have any threads.");
-#endif
-}
-
-void RawContext::suspend()
-{
- if (raw_context_parallel)
- RawContext::suspend_parallel();
- else
- RawContext::suspend_serial();
-}
-
-void RawContext::suspend_serial()
-{
- /* determine the next context */
- RawContext* next_context = nullptr;
- unsigned long int i;
- i = raw_process_index++;
- if (i < xbt_dynar_length(simix_global->process_to_run)) {
- /* execute the next process */
- XBT_DEBUG("Run next process");
- next_context = (RawContext*) 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 = (RawContext*) raw_maestro_context;
- }
- SIMIX_context_set_current(next_context);
- raw_swapcontext(&this->stack_top_, next_context->stack_top_);
-}
-
-void RawContext::suspend_parallel()
-{
-#if HAVE_THREAD_CONTEXTS
- /* determine the next context */
- smx_process_t next_work = (smx_process_t) xbt_parmap_next(raw_parmap);
- RawContext* next_context = nullptr;
-
- if (next_work != NULL) {
- /* there is a next process to resume */
- XBT_DEBUG("Run next process");
- next_context = (RawContext*) next_work->context;
- }
- else {
- /* all processes were run, go to the barrier */
- XBT_DEBUG("No more processes to run");
- uintptr_t worker_id = (uintptr_t)
- xbt_os_thread_get_specific(raw_worker_id_key);
- next_context = (RawContext*) raw_workers_context[worker_id];
- XBT_DEBUG("Restoring worker stack %zu (working threads = %zu)",
- worker_id, raw_threads_working);
- }
-
- SIMIX_context_set_current(next_context);
- raw_swapcontext(&this->stack_top_, next_context->stack_top_);
-#endif
-}
-
-void RawContext::resume()
-{
- if (raw_context_parallel)
- resume_parallel();
- else
- resume_serial();
-}
-
-void RawContext::resume_serial()
-{
- SIMIX_context_set_current(this);
- raw_swapcontext(&raw_maestro_context->stack_top_, this->stack_top_);
-}
-
-void RawContext::resume_parallel()
-{
-#if HAVE_THREAD_CONTEXTS
- uintptr_t worker_id = __sync_fetch_and_add(&raw_threads_working, 1);
- xbt_os_thread_set_specific(raw_worker_id_key, (void*) worker_id);
- RawContext* worker_context = (RawContext*) SIMIX_context_self();
- raw_workers_context[worker_id] = worker_context;
- XBT_DEBUG("Saving worker stack %zu", worker_id);
- SIMIX_context_set_current(this);
- raw_swapcontext(&worker_context->stack_top_, this->stack_top_);
-#else
- xbt_die("Parallel execution disabled");
-#endif
-}
-
-/** @brief Resumes all processes ready to run. */
-void RawContextFactory::run_all_adaptative()
-{
- unsigned long nb_processes = xbt_dynar_length(simix_global->process_to_run);
- if (SIMIX_context_is_parallel()
- && (unsigned long) SIMIX_context_get_parallel_threshold() < nb_processes) {
- raw_context_parallel = true;
- XBT_DEBUG("Runall // %lu", nb_processes);
- this->run_all_parallel();
- } else {
- XBT_DEBUG("Runall serial %lu", nb_processes);
- raw_context_parallel = false;
- this->run_all_serial();
- }
-}
-
-}
-}
