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/*
* Copyright (C) 2013-2019 Argonne National Laboratory, Department of Energy,
* UChicago Argonne, LLC and The HDF Group.
* All rights reserved.
*
* The full copyright notice, including terms governing use, modification,
* and redistribution, is contained in the COPYING file that can be
* found at the root of the source code distribution tree.
*/
#include "mercury_mem.h"
#include "mercury_util_error.h"
#ifdef _WIN32
# include <windows.h>
#else
# include <errno.h>
# include <fcntl.h> /* For O_* constants */
# include <string.h>
# include <sys/mman.h>
# include <sys/stat.h> /* For mode constants */
# include <sys/types.h>
# include <unistd.h>
#endif
#include <stdlib.h>
/*---------------------------------------------------------------------------*/
long
hg_mem_get_page_size(void)
{
long page_size;
#ifdef _WIN32
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
page_size = system_info.dwPageSize;
#else
page_size = sysconf(_SC_PAGE_SIZE);
#endif
return page_size;
}
/*---------------------------------------------------------------------------*/
void *
hg_mem_aligned_alloc(size_t alignment, size_t size)
{
void *mem_ptr = NULL;
#ifdef _WIN32
mem_ptr = _aligned_malloc(size, alignment);
#else
# ifdef _ISOC11_SOURCE
mem_ptr = aligned_alloc(alignment, size);
# else
int rc = posix_memalign(&mem_ptr, alignment, size);
if (rc != 0)
return NULL;
# endif
#endif
return mem_ptr;
}
/*---------------------------------------------------------------------------*/
void
hg_mem_aligned_free(void *mem_ptr)
{
#ifdef _WIN32
_aligned_free(mem_ptr);
#else
free(mem_ptr);
#endif
}
/*---------------------------------------------------------------------------*/
void *
hg_mem_shm_map(const char *name, size_t size, hg_util_bool_t create)
{
void *mem_ptr = NULL;
#ifdef _WIN32
HANDLE fd = INVALID_HANDLE_VALUE;
LARGE_INTEGER large = {.QuadPart = size};
DWORD access = FILE_MAP_READ | FILE_MAP_WRITE;
BOOL rc;
if (create) {
fd = CreateFileMappingA(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE,
large.HighPart, large.LowPart, name);
HG_UTIL_CHECK_ERROR_NORET(!fd, error, "CreateFileMappingA() failed");
} else {
fd = OpenFileMappingA(access, FALSE, name);
HG_UTIL_CHECK_ERROR_NORET(!fd, error, "OpenFileMappingA() failed");
}
mem_ptr = MapViewOfFile(fd, access, 0, 0, size);
HG_UTIL_CHECK_ERROR_NORET(!mem_ptr, error, "MapViewOfFile() failed");
/* The handle can be closed without affecting the memory mapping */
rc = CloseHandle(fd);
HG_UTIL_CHECK_ERROR_NORET(!rc, error, "CloseHandle() failed");
#else
int fd = 0;
int flags = O_RDWR | (create ? O_CREAT : 0);
struct stat shm_stat;
int rc;
fd = shm_open(name, flags, S_IRUSR | S_IWUSR);
HG_UTIL_CHECK_ERROR_NORET(
fd < 0, error, "shm_open() failed (%s)", strerror(errno));
rc = fstat(fd, &shm_stat);
HG_UTIL_CHECK_ERROR_NORET(
rc != 0, error, "fstat() failed (%s)", strerror(errno));
if (shm_stat.st_size == 0) {
rc = ftruncate(fd, (off_t) size);
HG_UTIL_CHECK_ERROR_NORET(
rc != 0, error, "ftruncate() failed (%s)", strerror(errno));
} else
HG_UTIL_CHECK_ERROR_NORET(
shm_stat.st_size < (off_t) size, error, "shm file size too small");
mem_ptr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, fd, 0);
HG_UTIL_CHECK_ERROR_NORET(
mem_ptr == MAP_FAILED, error, "mmap() failed (%s)", strerror(errno));
/* The file descriptor can be closed without affecting the memory mapping */
rc = close(fd);
HG_UTIL_CHECK_ERROR_NORET(
rc != 0, error, "close() failed (%s)", strerror(errno));
#endif
return mem_ptr;
error:
#ifdef _WIN32
if (fd)
CloseHandle(fd);
#else
if (fd > 0)
close(fd);
#endif
return NULL;
}
/*---------------------------------------------------------------------------*/
int
hg_mem_shm_unmap(const char *name, void *mem_ptr, size_t size)
{
int ret = HG_UTIL_SUCCESS;
#ifdef _WIN32
if (mem_ptr) {
BOOL rc = UnmapViewOfFile(mem_ptr);
HG_UTIL_CHECK_ERROR(
!rc, done, ret, HG_UTIL_FAIL, "UnmapViewOfFile() failed");
}
#else
if (mem_ptr && mem_ptr != MAP_FAILED) {
int rc = munmap(mem_ptr, size);
HG_UTIL_CHECK_ERROR(rc != 0, done, ret, HG_UTIL_FAIL,
"munmap() failed (%s)", strerror(errno));
}
if (name) {
int rc = shm_unlink(name);
HG_UTIL_CHECK_ERROR(rc != 0, done, ret, HG_UTIL_FAIL,
"shm_unlink() failed (%s)", strerror(errno));
}
#endif
done:
return ret;
}
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