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/* Copyright (c) 2013 Stanisław Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include <cstring>
#include "compat.h"
#if defined(_WIN32)
PortableLockedShm::PortableLockedShm(const char* shmName, const char* mutexName, int mapSize)
{
hMutex = CreateMutexA(NULL, false, mutexName);
hMapFile = CreateFileMappingA(
INVALID_HANDLE_VALUE,
NULL,
PAGE_READWRITE,
0,
mapSize,
shmName);
mem = MapViewOfFile(hMapFile,
FILE_MAP_WRITE,
0,
0,
mapSize);
}
PortableLockedShm::~PortableLockedShm()
{
UnmapViewOfFile(mem);
CloseHandle(hMapFile);
CloseHandle(hMutex);
}
void PortableLockedShm::lock()
{
(void) WaitForSingleObject(hMutex, INFINITE);
}
void PortableLockedShm::unlock()
{
(void) ReleaseMutex(hMutex);
}
#else
#pragma GCC diagnostic ignored "-Wunused-result"
PortableLockedShm::PortableLockedShm(const char *shmName, const char* /*mutexName*/, int mapSize) : size(mapSize)
{
char filename[512] = {0};
strcpy(filename, "/");
strcat(filename, shmName);
fd = shm_open(filename, O_RDWR | O_CREAT, 0600);
(void) ftruncate(fd, mapSize);
mem = mmap(NULL, mapSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, (off_t)0);
}
PortableLockedShm::~PortableLockedShm()
{
(void) munmap(mem, size);
(void) close(fd);
}
void PortableLockedShm::lock()
{
flock(fd, LOCK_EX);
}
void PortableLockedShm::unlock()
{
flock(fd, LOCK_UN);
}
#endif
bool PortableLockedShm::success()
{
#ifndef _WIN32
return (void*) mem != (void*) -1;
#else
return (void*) mem != NULL;
#endif
}
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