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Revert "Remove support for runtime multi-threading."

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This reverts revision r210600.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210603 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zachary Turner
2014-06-10 23:15:43 +00:00
parent 529e9d307e
commit 63ce00b72f
8 changed files with 79 additions and 42 deletions
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lib/Support/Threading.cpp
+36 -5
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@@ -19,19 +19,50 @@
using namespace llvm;
llvm::recursive_mutex& llvm::llvm_get_global_lock() {
static llvm::recursive_mutex global_lock;
return global_lock;
}
static bool multithreaded_mode = false;
bool llvm::llvm_is_multithreaded() {
static sys::Mutex* global_lock = nullptr;
bool llvm::llvm_start_multithreaded() {
#if LLVM_ENABLE_THREADS != 0
assert(!multithreaded_mode && "Already multithreaded!");
multithreaded_mode = true;
global_lock = new sys::Mutex(true);
// We fence here to ensure that all initialization is complete BEFORE we
// return from llvm_start_multithreaded().
sys::MemoryFence();
return true;
#else
return false;
#endif
}
void llvm::llvm_stop_multithreaded() {
#if LLVM_ENABLE_THREADS != 0
assert(multithreaded_mode && "Not currently multithreaded!");
// We fence here to insure that all threaded operations are complete BEFORE we
// return from llvm_stop_multithreaded().
sys::MemoryFence();
multithreaded_mode = false;
delete global_lock;
#endif
}
bool llvm::llvm_is_multithreaded() {
return multithreaded_mode;
}
void llvm::llvm_acquire_global_lock() {
if (multithreaded_mode) global_lock->acquire();
}
void llvm::llvm_release_global_lock() {
if (multithreaded_mode) global_lock->release();
}
#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
#include <pthread.h>