[llvm-commits] [llvm] r118222 - in /llvm/trunk: include/llvm/System/Threading.h lib/System/Threading.cpp
Daniel Dunbar
daniel at zuster.org
Wed Nov 3 18:26:25 PDT 2010
Author: ddunbar
Date: Wed Nov 3 20:26:25 2010
New Revision: 118222
URL: http://llvm.org/viewvc/llvm-project?rev=118222&view=rev
Log:
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.
Modified:
llvm/trunk/include/llvm/System/Threading.h
llvm/trunk/lib/System/Threading.cpp
Modified: llvm/trunk/include/llvm/System/Threading.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/System/Threading.h?rev=118222&r1=118221&r2=118222&view=diff
==============================================================================
--- llvm/trunk/include/llvm/System/Threading.h (original)
+++ llvm/trunk/include/llvm/System/Threading.h Wed Nov 3 20:26:25 2010
@@ -40,6 +40,20 @@
/// release_global_lock - Release the global lock. This is a no-op if called
/// before llvm_start_multithreaded().
void llvm_release_global_lock();
+
+ /// llvm_execute_on_thread - Execute the given \arg UserFn on a separate
+ /// thread, passing it the provided \arg UserData.
+ ///
+ /// This function does not guarantee that the code will actually be executed
+ /// on a separate thread or honoring the requested stack size, but tries to do
+ /// so where system support is available.
+ ///
+ /// \param UserFn - The callback to execute.
+ /// \param UserData - An argument to pass to the callback function.
+ /// \param RequestedStackSize - If non-zero, a requested size (in bytes) for
+ /// the thread stack.
+ void llvm_execute_on_thread(void (*UserFn)(void*), void *UserData,
+ unsigned RequestedStackSize = 0);
}
#endif
Modified: llvm/trunk/lib/System/Threading.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/System/Threading.cpp?rev=118222&r1=118221&r2=118222&view=diff
==============================================================================
--- llvm/trunk/lib/System/Threading.cpp (original)
+++ llvm/trunk/lib/System/Threading.cpp Wed Nov 3 20:26:25 2010
@@ -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
More information about the llvm-commits
mailing list