brpc/src/bthread/sys_futex.cpp at master · DeepCodeMind/brpc

36 lines (29 loc) · 1.14 KB

// bthread - A M:N threading library to make applications more concurrent.

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

// Author: Ge,Jun ([email protected])

// Date: Tue Jul 10 17:40:58 CST 2012

#include "bthread/sys_futex.h"

namespace bthread {

const int SYS_FUTEX_PRIVATE_FLAG = 128;

static int get_futex_private_flag() {

static int dummy = 0;

if (!syscall(SYS_futex, &dummy, (FUTEX_WAKE | SYS_FUTEX_PRIVATE_FLAG),

1, NULL, NULL, 0)) {

return SYS_FUTEX_PRIVATE_FLAG;

}

return 0;

}

extern const int futex_private_flag = get_futex_private_flag();

} // namespace bthread

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