/usr/include/seqan/system/system_sema.h is in seqan-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2010, Knut Reinert, FU Berlin
// All rights reserved.
//
// 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 Knut Reinert or the FU Berlin 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 KNUT REINERT OR THE FU BERLIN 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: David Weese <david.weese@fu-berlin.de>
// ==========================================================================
//SEQAN_NO_GENERATED_FORWARDS: no forwards are generated for this file
#ifndef SEQAN_HEADER_SYSTEM_SEMAPHORE_H
#define SEQAN_HEADER_SYSTEM_SEMAPHORE_H
namespace SEQAN_NAMESPACE_MAIN
{
#ifdef PLATFORM_WINDOWS
static SECURITY_ATTRIBUTES SemaphoreDefaultAttributes = {
sizeof(SECURITY_ATTRIBUTES),
NULL,
true
};
struct Semaphore
{
typedef LONG Type;
typedef HANDLE Handle;
enum { MAX_VALUE = MAXLONG };
Handle hSemaphore;
Semaphore(Type init = 0, Type max = MAX_VALUE) {
// Disable warnings on side-effect free operator!= in Release mode.
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( push )
#pragma warning( disable : 4552 )
#endif // #ifdef PLATFORM_WINDOWS_VS
SEQAN_DO_SYS2((hSemaphore = CreateSemaphore(&SemaphoreDefaultAttributes, init, max, NULL)) != NULL, "Could not create Semaphore");
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( pop )
#endif // #ifdef PLATFORM_WINDOWS_VS
}
~Semaphore() {
// Disable warnings on side-effect free operator!= in Release mode.
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( push )
#pragma warning( disable : 4552 )
#endif // #ifdef PLATFORM_WINDOWS_VS
SEQAN_DO_SYS2(CloseHandle(hSemaphore) != 0, "Could not destroy Semaphore");
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( pop )
#endif // #ifdef PLATFORM_WINDOWS_VS
}
bool lock(DWORD timeout_millis = INFINITE) {
return WaitForSingleObject(hSemaphore, timeout_millis) != WAIT_TIMEOUT;
}
void unlock() {
// Disable warnings on side-effect free operator!= in Release mode.
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( push )
#pragma warning( disable : 4552 )
#endif // #ifdef PLATFORM_WINDOWS_VS
SEQAN_DO_SYS2(ReleaseSemaphore(hSemaphore, 1, NULL) != 0, "Could not unlock Semaphore");
#ifdef PLATFORM_WINDOWS_VS
#pragma warning( pop )
#endif // #ifdef PLATFORM_WINDOWS_VS
}
private:
Semaphore(Semaphore const &) {
// resource copying is not yet supported (performance reason)
// it needs a reference counting technique
}
};
#else
struct Semaphore
{
typedef unsigned int Type;
typedef sem_t* Handle;
sem_t data, *hSemaphore;
Semaphore(Type init = 0):
hSemaphore(&data)
{
SEQAN_DO_SYS(!sem_init(hSemaphore, 0, init));
}
~Semaphore() {
SEQAN_DO_SYS(!sem_destroy(hSemaphore));
}
void lock() {
SEQAN_DO_SYS(!sem_wait(hSemaphore));
}
void unlock() {
SEQAN_DO_SYS(!sem_post(hSemaphore));
}
private:
Semaphore(Semaphore const &) {
// resource copying is not yet supported (performance reason)
// it needs a reference counting technique
}
};
#endif
}
#endif
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