* barrier.c: Move _LONG and _LPLONG defines into

	implement.h; rename to PTW32_INTERLOCKED_LONG and
	PTW32_INTERLOCKED_LPLONG respectively.
	* spin.c: Likewise; ptw32_interlocked_compare_exchange used
	in place of InterlockedCompareExchange directly.
	* global.c (ptw32_interlocked_compare_exchange): Add
	prototype for this new routine pointer to be used when
	InterlockedCompareExchange isn't supported by Windows.
	* nonportable.c (pthread_win32_process_attach_np): Check for
	support of InterlockedCompareExchange in kernel32 and assign its
	address to ptw32_interlocked_compare_exchange if it exists, or
	our own ix86 specific implementation ptw32_InterlockedCompareExchange.
	*private.c (ptw32_InterlockedCompareExchange): An
	implementation of InterlockedCompareExchange() which is
	specific to ix86; written directly in assembler for either
	MSVC or GNU C; needed because Windows 95 doesn't support
	InterlockedCompareExchange().

	* sched.c (sched_get_priority_min): Extend to return
	THREAD_PRIORITY_IDLE.
	(sched_get_priority_max): Extend to return
	THREAD_PRIORITY_CRITICAL.

1 files changed, 8 insertions, 0 deletions

diff --git a/global.c b/global.c
index 92ea8da..3a1c635 100644
--- a/global.c
+++ b/global.c
@@ -34,6 +34,14 @@ pthread_key_t ptw32_cleanupKey = NULL;
 
 int ptw32_concurrency = 0;
 
+/* 
+ * Function pointer to InterlockedCompareExchange if it exists; otherwise NULL 
+ */
+PTW32_INTERLOCKED_LONG
+(WINAPI *ptw32_interlocked_compare_exchange)(PTW32_INTERLOCKED_LPLONG,
+                                             PTW32_INTERLOCKED_LONG,
+                                             PTW32_INTERLOCKED_LONG) = NULL;
+
 /*
  * Global lock for testing internal state of PTHREAD_MUTEX_INITIALIZER
  * created mutexes.