From c0e45c61b54322f807e00233c9f104c225eb12bb Mon Sep 17 00:00:00 2001
From: deuce <>
Date: Sun, 4 Oct 2015 22:09:00 +0000
Subject: [PATCH] Add a pthread_once() implementation for Win32 (untested on
Win32).
---
src/xpdev/threadwrap.c | 22 ++++++++++++++++++++++
src/xpdev/threadwrap.h | 8 ++++++++
2 files changed, 30 insertions(+)
diff --git a/src/xpdev/threadwrap.c b/src/xpdev/threadwrap.c
index b7c727b35f..60acca5df0 100644
--- a/src/xpdev/threadwrap.c
+++ b/src/xpdev/threadwrap.c
@@ -126,6 +126,28 @@ pthread_mutex_t DLLCALL pthread_mutex_initializer_np(BOOL recursive)
#if !defined(_POSIX_THREADS)
+int DLLCALL pthread_once(pthread_once_t *oc, void (*init)(void))
+{
+ if (oc == NULL || init == NULL)
+ return EINVAL;
+ switch(InterlockedCompareExchange(&(oc->state), 1, 0)) {
+ case 0: // Never called
+ init();
+ InterlockedIncrement(&(oc->state));
+ return 0;
+ case 1: // In init function
+ /* We may not need to use InterlockedCompareExchange() here,
+ * but I hate marking things as volatile, and hate tight loops
+ * testing things that aren't marked volatile.
+ */
+ while(InterlockedCompareExchange(&(oc->state), 1, 0) != 2)
+ SLEEP(1);
+ return 0;
+ case 2: // Done.
+ return 0;
+ }
+}
+
int DLLCALL pthread_mutex_init(pthread_mutex_t* mutex, void* attr)
{
(void)attr;
diff --git a/src/xpdev/threadwrap.h b/src/xpdev/threadwrap.h
index bfd41467d2..f5944c9e92 100644
--- a/src/xpdev/threadwrap.h
+++ b/src/xpdev/threadwrap.h
@@ -123,6 +123,14 @@ DLLEXPORT int DLLCALL pthread_mutex_destroy(pthread_mutex_t*);
#define SetThreadName(c)
+// A structure in case we need to add an event or something...
+typedef struct {
+ uint32_t state;
+} pthread_once_t;
+
+#define PTHREAD_ONCE_INIT {0};
+DLLEXPORT int DLLCALL pthread_once(pthread_once_t *oc, void (*init)(void));
+
#endif
#if !defined(PTHREAD_MUTEX_INITIALIZER_NP)
--
GitLab