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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.
*/
#define IN_FTNOIR_COMPAT
#include "compat.h"
#include <string>
#include <sstream>
#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
PortableLockedShm::PortableLockedShm(const char *shmName, const char* /*mutexName*/, int mapSize) : size(mapSize)
{
std::string filename;
filename.append("/");
filename.append(shmName);
//(void) shm_unlink(shm_filename);
fd = shm_open(filename.c_str(), O_RDWR | O_CREAT, 0600);
if (ftruncate(fd, mapSize) == 0) { ;; }
else {
fprintf(stderr, "oh, bother, ftruncate: %s\n", strerror(errno));
//mem = (void*) -1;
}
mem = mmap(NULL, mapSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, (off_t)0);
}
PortableLockedShm::~PortableLockedShm()
{
//(void) shm_unlink(shm_filename);
(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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