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Implement process-shared locks support 

for libthr.so.3, without breaking the ABI. Special value is stored in
the lock pointer to indicate shared lock, and offline page in the shared
memory is allocated to store the actual lock.

Reviewed by:	vangyzen (previous version)
Discussed with:	deischen, emaste, jhb, rwatson,
	Martin Simmons <martin@lispworks.com>
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
kib 2016-02-28 17:52:33 +00:00 committed by Sebastian Huber
parent 7cfc736e89
commit c3df6d5155
1 changed files with 7 additions and 0 deletions
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7
newlib/libc/sys/rtems/include/sys/mman.h
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@ -233,6 +233,13 @@ struct shmfd {
int shm_map(struct file *fp, size_t size, off_t offset, void **memp);
int shm_unmap(struct file *fp, void *mem, size_t size);
int shm_access(struct shmfd *shmfd, struct ucred *ucred, int flags);
struct shmfd *shm_alloc(struct ucred *ucred, mode_t mode);
struct shmfd *shm_hold(struct shmfd *shmfd);
void shm_drop(struct shmfd *shmfd);
int shm_dotruncate(struct shmfd *shmfd, off_t length);
extern struct fileops shm_ops;
#else /* !_KERNEL */
__BEGIN_DECLS