llvm-6502/lib/Support/Windows/Threading.inc

#include <winbase.h>

#ifdef MemoryFence
// WinNT.h seems to define a MemoryFence macro.
#undef MemoryFence
#endif

void llvm::call_once(once_flag &flag, void (*fptr)(void)) {
  while (flag != Done) {
    if (flag == Wait) {
      ::Sleep(1);
      continue;
    }

    sys::cas_flag old_val = sys::CompareAndSwap(&flag, Wait, Uninitialized);
    if (old_val == Uninitialized) {
      fptr();
      sys::MemoryFence();
      flag = Done;
      return;
    }
  }
  sys::MemoryFence();
}
Removing the static initializer in ManagedStatic.cpp by using llvm_call_once to initialize the ManagedStatic mutex. Summary: This patch adds an llvm_call_once which is a wrapper around std::call_once on platforms where it is available and devoid of bugs. The patch also migrates the ManagedStatic mutex to be allocated using llvm_call_once. These changes are philosophically equivalent to the changes added in r219638, which were reverted due to a hang on Win32 which was the result of a bug in the Windows implementation of std::call_once. Reviewers: aaron.ballman, chapuni, chandlerc, rnk Reviewed By: rnk Subscribers: majnemer, llvm-commits Differential Revision: http://reviews.llvm.org/D5922 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220932 91177308-0d34-0410-b5e6-96231b3b80d8 2014-10-30 22:07:09 +00:00			`#include <winbase.h>`

Speculative fix for Windows build after r220932 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220936 91177308-0d34-0410-b5e6-96231b3b80d8 2014-10-30 23:10:01 +00:00			`#ifdef MemoryFence`
			`// WinNT.h seems to define a MemoryFence macro.`
			`#undef MemoryFence`
			`#endif`

Removing the static initializer in ManagedStatic.cpp by using llvm_call_once to initialize the ManagedStatic mutex. Summary: This patch adds an llvm_call_once which is a wrapper around std::call_once on platforms where it is available and devoid of bugs. The patch also migrates the ManagedStatic mutex to be allocated using llvm_call_once. These changes are philosophically equivalent to the changes added in r219638, which were reverted due to a hang on Win32 which was the result of a bug in the Windows implementation of std::call_once. Reviewers: aaron.ballman, chapuni, chandlerc, rnk Reviewed By: rnk Subscribers: majnemer, llvm-commits Differential Revision: http://reviews.llvm.org/D5922 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220932 91177308-0d34-0410-b5e6-96231b3b80d8 2014-10-30 22:07:09 +00:00			`void llvm::call_once(once_flag &flag, void (*fptr)(void)) {`
			`while (flag != Done) {`
			`if (flag == Wait) {`
			`::Sleep(1);`
			`continue;`
			`}`

			`sys::cas_flag old_val = sys::CompareAndSwap(&flag, Wait, Uninitialized);`
			`if (old_val == Uninitialized) {`
			`fptr();`
			`sys::MemoryFence();`
			`flag = Done;`
			`return;`
			`}`
			`}`
			`sys::MemoryFence();`
			`}`