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Merge pull request #5 from apposed/schmarrn
SharedMemory and NDArray implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /*- | ||
| * #%L | ||
| * Appose: multi-language interprocess cooperation with shared memory. | ||
| * %% | ||
| * Copyright (C) 2023 - 2024 Appose developers. | ||
| * %% | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright notice, | ||
| * this list of conditions and the following disclaimer. | ||
| * 2. 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. | ||
| * | ||
| * 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 THE COPYRIGHT HOLDERS OR CONTRIBUTORS 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. | ||
| * #L% | ||
| */ | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <fcntl.h> | ||
| #include <sys/mman.h> | ||
| #include <unistd.h> | ||
| #include <sys/stat.h> | ||
|
|
||
| // Function to get the size of a shared memory segment given its file descriptor | ||
| long get_shared_memory_size(int fd) { | ||
| struct stat shm_stat; | ||
| if (fstat(fd, &shm_stat) == -1) { | ||
| perror("fstat"); | ||
| return -1; | ||
| } | ||
| return (long)shm_stat.st_size; | ||
| } | ||
|
|
||
| // Function to create a shared memory segment, modified to accept a long for size | ||
| int create_shared_memory(const char *name, long size) { | ||
| int fd = shm_open(name, O_CREAT | O_RDWR, 0666); | ||
| if (fd < 0) { | ||
| perror("shm_open"); | ||
| return -1; | ||
| } | ||
| long already_size = get_shared_memory_size(fd); | ||
| if (already_size > 0) { | ||
| return fd; | ||
| } | ||
|
|
||
| if (ftruncate(fd, size) == -1) { | ||
| perror("ftruncate"); | ||
| close(fd); | ||
| return -1; | ||
| } | ||
|
|
||
| return fd; | ||
| } | ||
|
|
||
| // Function to unlink a shared memory segment | ||
| void unlink_shared_memory(const char *name) { | ||
| if (shm_unlink(name) == -1) { | ||
| perror("shm_unlink"); | ||
| } | ||
| } | ||
|
|
||
| int main() { | ||
| const char *shm_name = "/myshm"; | ||
| size_t shm_size = 1024; | ||
|
|
||
| // Create shared memory | ||
| int shm_fd = create_shared_memory(shm_name, shm_size); | ||
| if (shm_fd < 0) { | ||
| exit(EXIT_FAILURE); | ||
| } | ||
|
|
||
| // Perform operations with shared memory here | ||
| // ... | ||
|
|
||
| // Close the shared memory file descriptor | ||
| close(shm_fd); | ||
|
|
||
| // Unlink shared memory | ||
| unlink_shared_memory(shm_name); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
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