shared_memory.hh

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#pragma once
 
#include <stdio.h>
#include <pthread.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <cstdlib>
#include <stdint.h>
#include <unistd.h>
 
#define DEFAULT_KEY 85549
 
struct shm_buf{
  uint64_t chunk_size;
  char* buf;
  uint32_t chunk_index;
//  uint32_t chunk_offset;
//  bool commit;
};
 
struct semaphore {
    pthread_mutex_t lock;
    pthread_cond_t nonzero;
  unsigned head;
  unsigned tail;
  unsigned queue_size;
    unsigned count;
};
 
struct semaphore * semaphore_create(const char *semaphore_name, unsigned qs);
struct semaphore * semaphore_open(const char *semaphore_name);
void semaphore_close(struct semaphore *semap);