Fix/call once

[dzhwinter]

No description provided.

[qingqing01]

LGTM.

[qingqing01]

There is error:

[14:46:47] :	 [Step 1/1]  86/283 Test  #91: device_context_test .........................***Failed    1.50 sec
[14:46:47] :	 [Step 1/1] Running main() from gtest_main.cc
[14:46:47] :	 [Step 1/1] [==========] Running 2 tests from 1 test case.
[14:46:47] :	 [Step 1/1] [----------] Global test environment set-up.
[14:46:47] :	 [Step 1/1] [----------] 2 tests from Device
[14:46:47] :	 [Step 1/1] [ RUN      ] Device.Init
[14:46:47] :	 [Step 1/1] unknown file: Failure
[14:46:47] :	 [Step 1/1] C++ exception with description "std::exception at [/paddle/paddle/platform/device_context.cc:106]
[14:46:47] :	 [Step 1/1] PaddlePaddle Call Stacks: 
[14:46:47] :	 [Step 1/1] 0             0x432129p paddle::platform::EnforceNotMet::EnforceNotMet(std::__exception_ptr::exception_ptr, char const*, int) + 761
[14:46:47] :	 [Step 1/1] 1             0x42c71cp paddle::platform::CUDADeviceContext::CUDADeviceContext(paddle::platform::GPUPlace) + 3068
[14:46:47] :	 [Step 1/1] 2             0x428567p Device_Init_Test::TestBody() + 199
[14:46:47] :	 [Step 1/1] 3             0x45ba33p void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 67
[14:46:47] :	 [Step 1/1] 4             0x4516dap testing::Test::Run() + 186
[14:46:47] :	 [Step 1/1] 5             0x451828p testing::TestInfo::Run() + 280
[14:46:47] :	 [Step 1/1] 6             0x451935p testing::TestCase::Run() + 229
[14:46:47] :	 [Step 1/1] 7             0x453dd7p testing::internal::UnitTestImpl::RunAllTests() + 583
[14:46:47] :	 [Step 1/1] 8             0x454109p testing::UnitTest::Run() + 89
[14:46:47] :	 [Step 1/1] 9             0x4261c2p main + 50
[14:46:47] :	 [Step 1/1] 10      0x7fcb743bb830p __libc_start_main + 240
[14:46:47] :	 [Step 1/1] 11            0x4283c9p _start + 41
[14:46:47] :	 [Step 1/1] " thrown in the test body.
[14:46:47] :	 [Step 1/1] [  FAILED  ] Device.Init (818 ms)
[14:46:47] :	 [Step 1/1] [ RUN      ] Device.CUDADeviceContext
[14:46:47] :	 [Step 1/1] unknown file: Failure
[14:46:47] :	 [Step 1/1] C++ exception with description "std::exception at [/paddle/paddle/platform/device_context.cc:105]
[14:46:47] :	 [Step 1/1] PaddlePaddle Call Stacks: 
[14:46:47] :	 [Step 1/1] 0             0x432129p paddle::platform::EnforceNotMet::EnforceNotMet(std::__exception_ptr::exception_ptr, char const*, int) + 761
[14:46:47] :	 [Step 1/1] 1             0x42c356p paddle::platform::CUDADeviceContext::CUDADeviceContext(paddle::platform::GPUPlace) + 2102
[14:46:47] :	 [Step 1/1] 2             0x428921p Device_CUDADeviceContext_Test::TestBody() + 577
[14:46:47] :	 [Step 1/1] 3             0x45ba33p void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 67
[14:46:47] :	 [Step 1/1] 4             0x4516dap testing::Test::Run() + 186
[14:46:47] :	 [Step 1/1] 5             0x451828p testing::TestInfo::Run() + 280
[14:46:47] :	 [Step 1/1] 6             0x451935p testing::TestCase::Run() + 229
[14:46:47] :	 [Step 1/1] 7             0x453dd7p testing::internal::UnitTestImpl::RunAllTests() + 583
[14:46:47] :	 [Step 1/1] 8             0x454109p testing::UnitTest::Run() + 89
[14:46:47] :	 [Step 1/1] 9             0x4261c2p main + 50
[14:46:47] :	 [Step 1/1] 10      0x7fcb743bb830p __libc_start_main + 240
[14:46:47] :	 [Step 1/1] 11            0x4283c9p _start + 41
[14:46:47] :	 [Step 1/1] " thrown in the test body.
[14:46:47] :	 [Step 1/1] [  FAILED  ] Device.CUDADeviceContext (0 ms)

[dzhwinter]

Yes, this PR trigger a very strange error, I will dig into the reason after I finish my current work...

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