From c501826f42901c11147021164d9190e533f33659 Mon Sep 17 00:00:00 2001
From: fengjiayi <fengjiayi@baidu.com>
Date: Fri, 31 Aug 2018 17:14:29 +0800
Subject: [PATCH] use framework::RWLock

---
 paddle/fluid/framework/rw_lock.h        | 65 +++++++++++++++++++++++++
 paddle/fluid/platform/device_context.cc | 20 ++++----
 2 files changed, 76 insertions(+), 9 deletions(-)

diff --git a/paddle/fluid/framework/rw_lock.h b/paddle/fluid/framework/rw_lock.h
index a068d3543..4f1d9adbf 100644
--- a/paddle/fluid/framework/rw_lock.h
+++ b/paddle/fluid/framework/rw_lock.h
@@ -56,5 +56,70 @@ struct RWLock {
 };
 #endif
 
+class RWLockGuard {
+ public:
+  enum Status { kUnLock, kWRLock, kRDLock };
+
+  RWLockGuard(RWLock* rw_lock, Status init_status)
+      : lock_(rw_lock), status_(Status::kUnLock) {
+    switch (init_status) {
+      case Status::kRDLock: {
+        RDLock();
+        break;
+      }
+      case Status::kWRLock: {
+        WRLock();
+        break;
+      }
+    }
+  }
+
+  void WRLock() {
+    switch (status_) {
+      case Status::kUnLock: {
+        lock_->WRLock();
+        break;
+      }
+      case Status::kWRLock: {
+        break;
+      }
+      case Status::kRDLock: {
+        PADDLE_THROW(
+            "Please unlock read lock first before invoking write lock.");
+        break;
+      }
+    }
+  }
+
+  void RDLock() {
+    switch (status_) {
+      case Status::kUnLock: {
+        lock_->RDLock();
+        break;
+      }
+      case Status::kRDLock: {
+        break;
+      }
+      case Status::kWRLock: {
+        PADDLE_THROW(
+            "Please unlock write lock first before invoking read lock.");
+        break;
+      }
+    }
+  }
+
+  void UnLock() {
+    if (status_ != Status::kUnLock) {
+      lock_->UNLock();
+    }
+  }
+
+  ~RWLockGuard() { UnLock(); }
+
+ private:
+  RWLock* lock_;
+  Status status_;
+};
+
 }  // namespace framework
 }  // namespace paddle
diff --git a/paddle/fluid/platform/device_context.cc b/paddle/fluid/platform/device_context.cc
index 1e46e5de9..ec297ea9a 100644
--- a/paddle/fluid/platform/device_context.cc
+++ b/paddle/fluid/platform/device_context.cc
@@ -15,12 +15,11 @@ limitations under the License. */
 #include <unordered_set>
 #include <vector>
 
+#include "paddle/fluid/memory/memory.h"
 #ifdef PADDLE_WITH_CUDA
-#include <boost\thread\thread.hpp>
+#include "paddle/fluid/framework/rw_lock.h"
 #endif
 
-#include "paddle/fluid/memory/memory.h"
-
 namespace paddle {
 namespace platform {
 
@@ -158,9 +157,14 @@ class CudnnHolder {
 
   void RunFunc(const std::function<void(void*)>& cudnn_func,
                size_t required_workspace_len) {
-    boost::upgrade_lock<boost::shared_mutex> shared_lock(mtx_);
+    framework::RWLockGuard lock_guard(&rw_lock_,
+                                      framework::RWLockGuard::Status::kRDLock);
     if (required_workspace_len > workspace_len_) {
-      ReallocateWorkspace(required_workspace_len, &shared_lock);
+      lock_guard.UnLock();
+      lock_guard.WRLock();
+      ReallocateWorkspace(required_workspace_len);
+      lock_guard.UnLock();
+      lock_guard.RDLock();
     }
     cudnn_func(workspace_);
   }
@@ -168,9 +172,7 @@ class CudnnHolder {
   ~CudnnHolder() { PADDLE_ENFORCE(dynload::cudnnDestroy(cudnn_handle_)); }
 
  private:
-  void ReallocateWorkspace(size_t required_workspace_len,
-                           boost::upgrade_lock<boost::shared_mutex>* lock) {
-    boost::upgrade_to_unique_lock<boost::shared_mutex> unique_lock(*lock);
+  void ReallocateWorkspace(size_t required_workspace_len) {
     if (required_workspace_len <= workspace_len_) {
       return;
     }
@@ -192,7 +194,7 @@ class CudnnHolder {
   const cudaStream_t* stream_;  // not owned;
   const CUDAPlace place_;
 
-  boost::shared_mutex mtx_;
+  framework::RWLock rw_lock_;
 };
 
 CUDADeviceContext::CUDADeviceContext(CUDAPlace place)
-- 
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