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// Protocol Buffers - Google's data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Author: [email protected] (Kenton Varda) // // emulates google3/base/once.h // // This header is intended to be included only by internal .cc files and // generated .pb.cc files. Users should not use this directly. #include <google/protobuf/stubs/once.h> #ifndef GOOGLE_PROTOBUF_NO_THREAD_SAFETY #ifdef _WIN32 #include <windows.h> #else #include <sched.h> #endif #include <google/protobuf/stubs/atomicops.h> namespace google { namespace protobuf { namespace { void SchedYield() { #ifdef _WIN32 Sleep(0); #else // POSIX sched_yield(); #endif } } // namespace void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure) { internal::AtomicWord state = internal::Acquire_Load(once); // Fast path. The provided closure was already executed. if (state == ONCE_STATE_DONE) { return; } // The closure execution did not complete yet. The once object can be in one // of the two following states: // - UNINITIALIZED: We are the first thread calling this function. // - EXECUTING_CLOSURE: Another thread is already executing the closure. // // First, try to change the state from UNINITIALIZED to EXECUTING_CLOSURE // atomically. state = internal::Acquire_CompareAndSwap( once, ONCE_STATE_UNINITIALIZED, ONCE_STATE_EXECUTING_CLOSURE); if (state == ONCE_STATE_UNINITIALIZED) { // We are the first thread to call this function, so we have to call the // closure. closure->Run(); internal::Release_Store(once, ONCE_STATE_DONE); } else { // Another thread has already started executing the closure. We need to // wait until it completes the initialization. while (state == ONCE_STATE_EXECUTING_CLOSURE) { // Note that futex() could be used here on Linux as an improvement. SchedYield(); state = internal::Acquire_Load(once); } } } } // namespace protobuf } // namespace google #endif // GOOGLE_PROTOBUF_NO_THREAD_SAFETY