Update mojo sdk to rev 8af2ccff2eee4bfca1043015abee30482a030b30

third_party/mojo/src/mojo/public/go/system/shared_buffer.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package system
 
 //#include "c_allocators.h"
 //#include "mojo/public/c/system/core.h"
 import "C"
 import "unsafe"
@@ skipping 13 matching lines @@
 
         // UnmapBuffer unmaps a buffer that was returned by MapBuffer.
         UnmapBuffer(buffer []byte) MojoResult
 }
 
 type sharedBuffer struct {
         baseHandle
 }
 
 func (h *sharedBuffer) DuplicateBufferHandle(opts *DuplicateBufferHandleOptions) (MojoResult, SharedBufferHandle) {
+        h.core.mu.Lock()
+        defer h.core.mu.Unlock()
+
         cParams := C.MallocDuplicateBufferHandleParams()
         defer C.FreeDuplicateBufferHandleParams(cParams)
         result := C.MojoDuplicateBufferHandle(h.mojoHandle.cValue(), opts.cValue(cParams.opts), cParams.duplicate)
         return MojoResult(result), core.acquireCHandle(*cParams.duplicate).ToSharedBufferHandle()
 }
 
 func (h *sharedBuffer) MapBuffer(offset uint64, numBytes int, flags MojoMapBufferFlags) (MojoResult, []byte) {
+        h.core.mu.Lock()
+        defer h.core.mu.Unlock()
+
         cParams := C.MallocMapBufferParams()
         defer C.FreeMapBufferParams(cParams)
         result := C.MojoMapBuffer(h.mojoHandle.cValue(), C.uint64_t(offset), C.uint64_t(numBytes), cParams.buffer, flags.cValue())
         if result != C.MOJO_RESULT_OK {
                 return MojoResult(result), nil
         }
         return MOJO_RESULT_OK, unsafeByteSlice(unsafe.Pointer(*cParams.buffer), numBytes)
 }
 
 func (h *sharedBuffer) UnmapBuffer(buffer []byte) MojoResult {
+        h.core.mu.Lock()
+        defer h.core.mu.Unlock()
+
         return MojoResult(C.MojoUnmapBuffer(unsafe.Pointer(&buffer[0])))
 }