Split atomic and mutex implementations and make inlinable.

src/ports/SkMutex_pthread.h

Index: src/ports/SkMutex_pthread.h
===================================================================
--- src/ports/SkMutex_pthread.h	(revision 0)
+++ src/ports/SkMutex_pthread.h	(working copy)
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMutex_pthread_DEFINED
+#define SkMutex_pthread_DEFINED
+
+/** Posix pthread_mutex based mutex. */
+
+#ifdef SK_DEBUG_PTHREAD_MUTEX
+#include "SkTypes.h"
+#define SkDEBUGCODE_PTHREAD_MUTEX(code) code
+#else
+#define SkDEBUGCODE_PTHREAD_MUTEX(code)
+#ifndef SkDebugf
+    void SkDebugf(const char format[], ...);
+#endif
+#endif
+
+#include <errno.h>
+#include <pthread.h>
+
+// A SkBaseMutex is a POD structure that can be directly initialized
+// at declaration time with SK_DECLARE_STATIC/GLOBAL_MUTEX. This avoids the
+// generation of a static initializer in the final machine code (and
+// a corresponding static finalizer).
+struct SkBaseMutex {
+    void acquire() { pthread_mutex_lock(&fMutex); }
+    void release() { pthread_mutex_unlock(&fMutex); }
+    pthread_mutex_t fMutex;
+};
+
+// A normal mutex that requires to be initialized through normal C++ construction,
+// i.e. when it's a member of another class, or allocated on the heap.
+class SkMutex : public SkBaseMutex {
+public:
+    SkMutex() {
+        SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_init(&fMutex, NULL);
+        SkDEBUGCODE_PTHREAD_MUTEX(
+            if (status != 0) {
+                print_pthread_error(status);
+                SkASSERT(0 == status);
+            }
+        )
+    }
+
+    ~SkMutex() {
+        SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_destroy(&fMutex);
+        SkDEBUGCODE_PTHREAD_MUTEX(
+            if (status != 0) {
+                print_pthread_error(status);
+                SkASSERT(0 == status);
+            }
+        )
+    }
+
+private:
+    SkMutex(const SkMutex&);
+    SkMutex& operator=(const SkMutex&);
+
+    static void print_pthread_error(int status) {
+        switch (status) {
+        case 0: // success
+            break;
+        case EINVAL:
+            SkDebugf("pthread error [%d] EINVAL\n", status);
+            break;
+        case EBUSY:
+            SkDebugf("pthread error [%d] EBUSY\n", status);
+            break;
+        default:
+            SkDebugf("pthread error [%d] unknown\n", status);
+            break;
+        }
+    }
+};
+
+// Using POD-style initialization prevents the generation of a static initializer.
+#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
+
+// Special case used when the static mutex must be available globally.
+#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
+
+#endif