//
//===----------------------------------------------------------------------===//
//
-// This file implements helper functions for running LLVM in a multi-threaded
-// environment.
+// This file implements llvm_start_multithreaded() and friends.
//
//===----------------------------------------------------------------------===//
using namespace llvm;
-bool llvm::llvm_is_multithreaded() {
+static bool multithreaded_mode = false;
+
+bool llvm::llvm_start_multithreaded() {
#if LLVM_ENABLE_THREADS != 0
+ assert(!multithreaded_mode && "Already multithreaded!");
+ multithreaded_mode = 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;
+#endif
+}
+
+bool llvm::llvm_is_multithreaded() {
+ return multithreaded_mode;
+}
+
#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
#include <pthread.h>