System: Add llvm_execute_on_thread, which does what it says.
- Primarily useful for running some code with a specified stack size, when
pthreads are available.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118222 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Threading.cpp b/lib/System/Threading.cpp
index 466c468..3b0bc72 100644
--- a/lib/System/Threading.cpp
+++ b/lib/System/Threading.cpp
@@ -62,3 +62,55 @@
void llvm::llvm_release_global_lock() {
if (multithreaded_mode) global_lock->release();
}
+
+#if defined(LLVM_MULTITHREADED) && defined(HAVE_PTHREAD_H)
+#include <pthread.h>
+
+struct ThreadInfo {
+ void (*UserFn)(void *);
+ void *UserData;
+};
+static void *ExecuteOnThread_Dispatch(void *Arg) {
+ ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
+ TI->UserFn(TI->UserData);
+ return 0;
+}
+
+void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
+ unsigned RequestedStackSize) {
+ ThreadInfo Info = { Fn, UserData };
+ pthread_attr_t Attr;
+ pthread_t Thread;
+
+ // Construct the attributes object.
+ if (::pthread_attr_init(&Attr) != 0)
+ return;
+
+ // Set the requested stack size, if given.
+ if (RequestedStackSize != 0) {
+ if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
+ goto error;
+ }
+
+ // Construct and execute the thread.
+ if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
+ goto error;
+
+ // Wait for the thread and clean up.
+ ::pthread_join(Thread, 0);
+
+ error:
+ ::pthread_attr_destroy(&Attr);
+}
+
+#else
+
+// No non-pthread implementation, currently.
+
+void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
+ unsigned RequestedStackSize) {
+ (void) RequestedStackSize;
+ Fn(UserData);
+}
+
+#endif