|author||Rich Felker <firstname.lastname@example.org>||2020-10-28 16:13:45 -0400|
|committer||Rich Felker <email@example.com>||2020-10-28 16:13:45 -0400|
fix sem_close unmapping of still-referenced semaphore
sem_open is required to return the same sem_t pointer for all references to the same named semaphore when it's opened more than once in the same process. thus we keep a table of all the mapped semaphores and their reference counts. the code path for sem_close checked the reference count, but then proceeded to unmap the semaphore regardless of whether the count had reached zero. add an immediate unlock-and-return for the nonzero refcnt case so the property of performing the munmap syscall after releasing the lock can be preserved.
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions