[Pixman] [PATCH 1/8] Add platform specific mutex implementations

[Taekyun Kim]

From: Taekyun Kim <tkq.kim at samsung.com>

Declare mutex with type of pixman_mutex_t and use following macros.

PIXMAN_MUTEX_INIT()
PIXMAN_MUTEX_LOCK()
PIXMAN_MUTEX_UNLOCK()
PIXMAN_MUTEX_FINI()

If any mutex implemenatation is supported by the system, HAVE_MUTEX
macro will be defined.
---
 configure.ac             |    3 +++
 pixman/pixman-compiler.h |   39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index dc523df..8771ec9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -679,6 +679,9 @@ if test x$have_gettimeofday = xyes && test x$have_sys_time_h = xyes; then
    AC_DEFINE(HAVE_GETTIMEOFDAY, 1, [Whether we have gettimeofday()])
 fi
 
+AC_CHECK_HEADER([pthread.h],
+    [AC_DEFINE(HAVE_PTHREAD_H, [1], [Define to 1 if we have <pthread.h>])])
+
 dnl =====================================
 dnl Thread local storage
 
diff --git a/pixman/pixman-compiler.h b/pixman/pixman-compiler.h
index fe2a613..47e68c5 100644
--- a/pixman/pixman-compiler.h
+++ b/pixman/pixman-compiler.h
@@ -207,3 +207,42 @@
 #    error "Unknown thread local support for this system. Pixman will not work with multiple threads. Define PIXMAN_NO_TLS to acknowledge and accept this limitation and compile pixman without thread-safety support."
 
 #endif
+
+#if defined(HAVE_PTHREAD_H)
+
+#   include <pthread.h>
+
+typedef pthread_mutex_t	pixman_mutex_t;
+
+#   define PIXMAN_MUTEX_INIT(mutex)	pthread_mutex_init (&(mutex), NULL)
+#   define PIXMAN_MUTEX_LOCK(mutex)	pthread_mutex_lock (&(mutex))
+#   define PIXMAN_MUTEX_UNLOCK(mutex)	pthread_mutex_unlock (&(mutex))
+#   define PIXMAN_MUTEX_FINI(mutex)	pthread_mutex_destroy (&(mutex))
+
+#   define HAVE_MUTEX	1
+
+#elif defined(_WIN32)
+
+#   include <windows.h>
+
+typedef CRITICAL_SECTION pixman_mutex_t;
+
+#   define PIXMAN_MUTEX_INIT(mutex)	InitializeCriticalSection (&(mutex))
+#   define PIXMAN_MUTEX_LOCK(mutex)	EnterCriticalSection (&(mutex))
+#   define PIXMAN_MUTEX_UNLOCK(mutex)	LeaveCriticalSection (&(mutex))
+#   define PIXMAN_MUTEX_FINI(mutex)	DeleteCriticalSection (&(mutex))
+
+#   define HAVE_MUTEX	1
+
+#else
+
+typedef int pixman_mutex_t;
+
+#   define PIXMAN_MUTEX_INIT(mutex)	do while (0) {}
+#   define PIXMAN_MUTEX_LOCK(mutex)	do while (0) {}
+#   define PIXMAN_MUTEX_UNLOCK(mutex)	do while (0) {}
+#   define PIXMAN_MUTEX_FINI(mutex)	do while (0) {}
+
+#   warning "Unknown mutex support for this system. Pixman will work without mutex support."
+
+#endif
-- 
1.7.1