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#define BUILD_SHM
#include "shm.h"
#ifdef SHM_WIN32
#include <windows.h>
SHM_FUN(void, init, const char* shm_name, const char* mutex_name, int map_size)
{
if (mutex_name != NULL)
{
self->mutex = CreateMutexA(NULL, false, mutex_name);
if (!self->mutex)
goto fail;
}
self->mapped_file = CreateFileMappingA(
INVALID_HANDLE_VALUE,
NULL,
PAGE_READWRITE,
0,
(unsigned)map_size,
shm_name);
if (!self->mapped_file)
goto fail;
self->mem = MapViewOfFile(self->mapped_file,
FILE_MAP_WRITE,
0,
0,
(unsigned) map_size);
if (!self->mem)
goto fail;
return;
fail:
SHM_FUN_NAME(free)(self);
}
SHM_FUN0(void, free)
{
if (self->mem)
(void) UnmapViewOfFile(self->mem);
if (self->mapped_file)
(void) CloseHandle(self->mapped_file);
if (self->mutex)
(void) CloseHandle(self->mutex);
self->mem = NULL;
self->mapped_file = NULL;
self->mutex = NULL;
}
SHM_FUN0(void, lock)
{
if (self->mutex)
(void)(WaitForSingleObject(self->mutex, INFINITE) == WAIT_OBJECT_0);
}
SHM_FUN0(void, unlock)
{
(void) ReleaseMutex(self->mutex);
}
SHM_FUN0(bool, success)
{
return self->mem != NULL;
}
#else
#include <stdio.h>
#include <string.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <alloca.h>
//#pragma GCC diagnostic ignored "-Wunused-result"
SHM_FUN(void, init, const char *shm_name, const char* mutex_name, int map_size)
{
char* filename = alloca(strlen(shm_name)+2);
(void)mutex_name;
self->mem = (void*)-1;
self->fd = -1;
self->size = 0;
if (map_size <= 0)
goto fail;
self->size = map_size;
strcpy(filename, "/");
strcat(filename, shm_name);
self->fd = shm_open(filename, O_RDWR | O_CREAT, 0600);
(void)ftruncate(self->fd, (off_t)map_size);
self->mem = mmap(NULL, (size_t)map_size, PROT_READ|PROT_WRITE, MAP_SHARED, self->fd, (off_t)0);
if (self->mem == (void*)-1)
goto fail;
return;
fail:
SHM_FUN_NAME(free)(self);
}
SHM_FUN0(void, free)
{
if (self->mem != (void*)-1)
(void)munmap(self->mem, self->size);
if (self->fd != -1)
(void)close(self->fd);
self->mem = (void*)-1;
self->fd = -1;
self->size = 0;
}
SHM_FUN0(void, lock)
{
flock(self->fd, LOCK_EX);
}
SHM_FUN0(void, unlock)
{
flock(self->fd, LOCK_UN);
}
SHM_FUN0(bool, success)
{
return self->mem != (void*) -1;
}
#endif
SHM_FUN0(void*, ptr)
{
return self->mem;
}
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