diff options
Diffstat (limited to 'lib/Support/Threading.cpp')
-rw-r--r-- | lib/Support/Threading.cpp | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/lib/Support/Threading.cpp b/lib/Support/Threading.cpp index ca7f3f64aa..2358dde0e6 100644 --- a/lib/Support/Threading.cpp +++ b/lib/Support/Threading.cpp @@ -7,8 +7,7 @@ // //===----------------------------------------------------------------------===// // -// This file defines helper functions for running LLVM in a multi-threaded -// environment. +// This file implements llvm_start_multithreaded() and friends. // //===----------------------------------------------------------------------===// @@ -20,14 +19,38 @@ 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> |