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4bfbc355de
To avoid unnecessary warnings and errors in the future I'd like to propose building all cgo related sources with `-Wall -Werror`. This commit fixes some warnings which came up in `shm_lock.c`, too. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#ifndef shm_locks_h_
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#define shm_locks_h_
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#include <pthread.h>
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#include <stdint.h>
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// Magic number to ensure we open the right SHM segment
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#define MAGIC 0x87D1
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// Type for our bitmaps
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typedef uint32_t bitmap_t;
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// bitmap size
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#define BITMAP_SIZE (sizeof(bitmap_t) * 8)
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// Struct to hold a single bitmap and associated locks
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typedef struct lock_group {
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bitmap_t bitmap;
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pthread_mutex_t locks[BITMAP_SIZE];
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} lock_group_t;
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// Struct to hold our SHM locks.
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// Unused is required to be 0 in the current implementation. If we ever make
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// changes to this structure in the future, this will be repurposed as a version
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// field.
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typedef struct shm_struct {
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uint16_t magic;
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uint16_t unused;
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pthread_mutex_t segment_lock;
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uint32_t num_bitmaps;
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uint32_t num_locks;
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lock_group_t locks[];
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} shm_struct_t;
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shm_struct_t *setup_lock_shm(char *path, uint32_t num_locks, int *error_code);
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shm_struct_t *open_lock_shm(char *path, uint32_t num_locks, int *error_code);
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int32_t close_lock_shm(shm_struct_t *shm);
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int64_t allocate_semaphore(shm_struct_t *shm);
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int32_t allocate_given_semaphore(shm_struct_t *shm, uint32_t sem_index);
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int32_t deallocate_semaphore(shm_struct_t *shm, uint32_t sem_index);
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int32_t deallocate_all_semaphores(shm_struct_t *shm);
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int32_t lock_semaphore(shm_struct_t *shm, uint32_t sem_index);
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int32_t unlock_semaphore(shm_struct_t *shm, uint32_t sem_index);
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#endif
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