[RocksDB] fix build env_test

Summary: move the TwoPools test to the end of thread related tests. Otherwise, the SetBackgroundThreads call would increase the Low pool size and affect the result of other tests.

Test Plan: make env_test; ./env_test

Reviewers: dhruba, emayanke, xjin

Reviewed By: xjin

CC: leveldb

Differential Revision: https://reviews.facebook.net/D12939

util/env_test.cc

@@ -30,80 +30,6 @@ static void SetBool(void* ptr) {
   reinterpret_cast<port::AtomicPointer*>(ptr)->NoBarrier_Store(ptr);
 }
 
-TEST(EnvPosixTest, TwoPools) {
-
-  class CB {
-   public:
-    CB(const std::string& pool_name, int pool_size)
-        : mu_(),
-          num_running_(0),
-          num_finished_(0),
-          pool_size_(pool_size),
-          pool_name_(pool_name) { }
-
-    static void Run(void* v) {
-      CB* cb = reinterpret_cast<CB*>(v);
-      cb->Run();
-    }
-
-    void Run() {
-      {
-        MutexLock l(&mu_);
-        num_running_++;
-        std::cout << "Pool " << pool_name_ << ": "
-                  << num_running_ << " running threads.\n";
-        // make sure we don't have more than pool_size_ jobs running.
-        ASSERT_LE(num_running_, pool_size_);
-      }
-
-      // sleep for 1 sec
-      Env::Default()->SleepForMicroseconds(1000000);
-
-      {
-        MutexLock l(&mu_);
-        num_running_--;
-        num_finished_++;
-      }
-    }
-
-    int NumFinished() {
-      MutexLock l(&mu_);
-      return num_finished_;
-    }
-
-   private:
-    port::Mutex mu_;
-    int num_running_;
-    int num_finished_;
-    int pool_size_;
-    std::string pool_name_;
-  };
-
-  const int kLowPoolSize = 2;
-  const int kHighPoolSize = 4;
-  const int kJobs = 8;
-
-  CB low_pool_job("low", kLowPoolSize);
-  CB high_pool_job("high", kHighPoolSize);
-
-
-  env_->SetBackgroundThreads(kLowPoolSize);
-  env_->SetBackgroundThreads(kHighPoolSize, Env::Priority::HIGH);
-
-  // schedule same number of jobs in each pool
-  for (int i = 0; i < kJobs; i++) {
-    env_->Schedule(&CB::Run, &low_pool_job);
-    env_->Schedule(&CB::Run, &high_pool_job, Env::Priority::HIGH);
-  }
-
-  // wait for all jobs to finish
-  while (low_pool_job.NumFinished() < kJobs ||
-         high_pool_job.NumFinished() < kJobs) {
-    env_->SleepForMicroseconds(kDelayMicros);
-  }
-}
-
-
 TEST(EnvPosixTest, RunImmediately) {
   port::AtomicPointer called (nullptr);
   env_->Schedule(&SetBool, &called);
@@ -176,6 +102,78 @@ TEST(EnvPosixTest, StartThread) {
   ASSERT_EQ(state.val, 3);
 }
 
+TEST(EnvPosixTest, TwoPools) {
+
+  class CB {
+   public:
+    CB(const std::string& pool_name, int pool_size)
+        : mu_(),
+          num_running_(0),
+          num_finished_(0),
+          pool_size_(pool_size),
+          pool_name_(pool_name) { }
+
+    static void Run(void* v) {
+      CB* cb = reinterpret_cast<CB*>(v);
+      cb->Run();
+    }
+
+    void Run() {
+      {
+        MutexLock l(&mu_);
+        num_running_++;
+        std::cout << "Pool " << pool_name_ << ": "
+                  << num_running_ << " running threads.\n";
+        // make sure we don't have more than pool_size_ jobs running.
+        ASSERT_LE(num_running_, pool_size_);
+      }
+
+      // sleep for 1 sec
+      Env::Default()->SleepForMicroseconds(1000000);
+
+      {
+        MutexLock l(&mu_);
+        num_running_--;
+        num_finished_++;
+      }
+    }
+
+    int NumFinished() {
+      MutexLock l(&mu_);
+      return num_finished_;
+    }
+
+   private:
+    port::Mutex mu_;
+    int num_running_;
+    int num_finished_;
+    int pool_size_;
+    std::string pool_name_;
+  };
+
+  const int kLowPoolSize = 2;
+  const int kHighPoolSize = 4;
+  const int kJobs = 8;
+
+  CB low_pool_job("low", kLowPoolSize);
+  CB high_pool_job("high", kHighPoolSize);
+
+  env_->SetBackgroundThreads(kLowPoolSize);
+  env_->SetBackgroundThreads(kHighPoolSize, Env::Priority::HIGH);
+
+  // schedule same number of jobs in each pool
+  for (int i = 0; i < kJobs; i++) {
+    env_->Schedule(&CB::Run, &low_pool_job);
+    env_->Schedule(&CB::Run, &high_pool_job, Env::Priority::HIGH);
+  }
+
+  // wait for all jobs to finish
+  while (low_pool_job.NumFinished() < kJobs ||
+         high_pool_job.NumFinished() < kJobs) {
+    env_->SleepForMicroseconds(kDelayMicros);
+  }
+}
+
 bool IsSingleVarint(const std::string& s) {
   Slice slice(s);