mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
![David Xu](/assets/img/avatar_default.png)
now type sema_t is a structure which can be put in a shared memory area, and multiple processes can operate it concurrently. User can either use mmap(MAP_SHARED) + sem_init(pshared=1) or use sem_open() to initialize a shared semaphore. Named semaphore uses file system and is located in /tmp directory, and its file name is prefixed with 'SEMD', so now it is chroot or jail friendly. In simplist cases, both for named and un-named semaphore, userland code does not have to enter kernel to reduce/increase semaphore's count. The semaphore is designed to be crash-safe, it means even if an application is crashed in the middle of operating semaphore, the semaphore state is still safely recovered by later use, there is no waiter counter maintained by userland code. The main semaphore code is in libc and libthr only has some necessary stubs, this makes it possible that a non-threaded application can use semaphore without linking to thread library. Old semaphore implementation is kept libc to maintain binary compatibility. The kernel ksem API is no longer used in the new implemenation. Discussed on: threads@
407 lines
8.4 KiB
Plaintext
407 lines
8.4 KiB
Plaintext
/*
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* $FreeBSD$
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*/
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/*
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* Use the same naming scheme as libc.
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*/
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FBSD_1.0 {
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__error;
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accept;
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aio_suspend;
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close;
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connect;
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creat;
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execve;
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fcntl;
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fork;
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fsync;
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msync;
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nanosleep;
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open;
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pause;
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poll;
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pselect;
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pthread_atfork;
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pthread_barrier_destroy;
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pthread_barrier_init;
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pthread_barrier_wait;
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pthread_barrierattr_destroy;
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pthread_barrierattr_getpshared;
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pthread_barrierattr_init;
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pthread_barrierattr_setpshared;
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pthread_attr_destroy;
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pthread_attr_get_np;
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pthread_attr_getdetachstate;
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pthread_attr_getguardsize;
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pthread_attr_getinheritsched;
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pthread_attr_getschedparam;
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pthread_attr_getschedpolicy;
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pthread_attr_getscope;
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pthread_attr_getstack;
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pthread_attr_getstackaddr;
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pthread_attr_getstacksize;
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pthread_attr_init;
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pthread_attr_setcreatesuspend_np;
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pthread_attr_setdetachstate;
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pthread_attr_setguardsize;
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pthread_attr_setinheritsched;
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pthread_attr_setschedparam;
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pthread_attr_setschedpolicy;
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pthread_attr_setscope;
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pthread_attr_setstack;
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pthread_attr_setstackaddr;
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pthread_attr_setstacksize;
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pthread_cancel;
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pthread_cleanup_pop;
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pthread_cleanup_push;
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pthread_cond_broadcast;
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pthread_cond_destroy;
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pthread_cond_init;
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pthread_cond_signal;
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pthread_cond_timedwait;
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pthread_cond_wait;
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pthread_condattr_destroy;
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pthread_condattr_getclock;
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pthread_condattr_getpshared;
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pthread_condattr_init;
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pthread_condattr_setclock;
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pthread_condattr_setpshared;
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pthread_create;
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pthread_detach;
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pthread_equal;
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pthread_exit;
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pthread_getconcurrency;
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pthread_getprio;
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pthread_getschedparam;
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pthread_getspecific;
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pthread_join;
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pthread_key_create;
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pthread_key_delete;
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pthread_kill;
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pthread_main_np;
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pthread_multi_np;
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pthread_mutex_destroy;
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pthread_mutex_getprioceiling;
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pthread_mutex_init;
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pthread_mutex_lock;
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pthread_mutex_setprioceiling;
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pthread_mutex_timedlock;
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pthread_mutex_trylock;
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pthread_mutex_unlock;
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pthread_mutexattr_destroy;
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pthread_mutexattr_getkind_np;
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pthread_mutexattr_getprioceiling;
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pthread_mutexattr_getpshared;
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pthread_mutexattr_getprotocol;
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pthread_mutexattr_gettype;
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pthread_mutexattr_init;
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pthread_mutexattr_setkind_np;
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pthread_mutexattr_setprioceiling;
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pthread_mutexattr_setprotocol;
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pthread_mutexattr_setpshared;
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pthread_mutexattr_settype;
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pthread_once;
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pthread_resume_all_np;
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pthread_resume_np;
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pthread_rwlock_destroy;
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pthread_rwlock_init;
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pthread_rwlock_rdlock;
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pthread_rwlock_timedrdlock;
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pthread_rwlock_timedwrlock;
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pthread_rwlock_tryrdlock;
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pthread_rwlock_trywrlock;
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pthread_rwlock_unlock;
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pthread_rwlock_wrlock;
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pthread_rwlockattr_destroy;
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pthread_rwlockattr_getpshared;
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pthread_rwlockattr_init;
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pthread_rwlockattr_setpshared;
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pthread_set_name_np;
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pthread_self;
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pthread_setcancelstate;
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pthread_setcanceltype;
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pthread_setconcurrency;
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pthread_setprio;
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pthread_setschedparam;
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pthread_setspecific;
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pthread_sigmask;
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pthread_single_np;
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pthread_spin_destroy;
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pthread_spin_init;
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pthread_spin_lock;
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pthread_spin_trylock;
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pthread_spin_unlock;
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pthread_suspend_all_np;
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pthread_suspend_np;
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pthread_switch_add_np;
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pthread_switch_delete_np;
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pthread_testcancel;
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pthread_timedjoin_np;
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pthread_yield;
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raise;
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read;
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readv;
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recvfrom;
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recvmsg;
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select;
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sendmsg;
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sendto;
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sigaction;
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sigprocmask;
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sigsuspend;
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sigwait;
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sigwaitinfo;
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sigtimedwait;
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sleep;
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system;
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tcdrain;
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usleep;
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wait;
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wait3;
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wait4;
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waitpid;
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write;
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writev;
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};
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/*
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* List the private interfaces reserved for use in FreeBSD libraries.
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* These are not part of our application ABI.
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*/
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FBSDprivate_1.0 {
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___creat;
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___pause;
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___pselect;
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___sleep;
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___system;
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___tcdrain;
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___usleep;
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___wait;
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___waitpid;
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__accept;
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__aio_suspend;
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__close;
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__connect;
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__fcntl;
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__fsync;
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__msync;
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__nanosleep;
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__open;
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__openat;
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__poll;
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__pthread_cond_timedwait;
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__pthread_cond_wait;
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__pthread_mutex_init;
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__pthread_mutex_lock;
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__pthread_mutex_timedlock;
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__pthread_mutex_trylock;
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__read;
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__readv;
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__recvfrom;
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__recvmsg;
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__select;
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__sendmsg;
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__sendto;
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__sigsuspend;
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__sigtimedwait;
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__sigwait;
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__sigwaitinfo;
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__wait3;
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__wait4;
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__write;
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__writev;
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_fork;
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_pthread_atfork;
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_pthread_barrier_destroy;
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_pthread_barrier_init;
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_pthread_barrier_wait;
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_pthread_barrierattr_destroy;
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_pthread_barrierattr_getpshared;
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_pthread_barrierattr_init;
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_pthread_barrierattr_setpshared;
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_pthread_attr_destroy;
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_pthread_attr_get_np;
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_pthread_attr_getaffinity_np;
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_pthread_attr_getdetachstate;
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_pthread_attr_getguardsize;
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_pthread_attr_getinheritsched;
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_pthread_attr_getschedparam;
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_pthread_attr_getschedpolicy;
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_pthread_attr_getscope;
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_pthread_attr_getstack;
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_pthread_attr_getstackaddr;
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_pthread_attr_getstacksize;
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_pthread_attr_init;
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_pthread_attr_setaffinity_np;
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_pthread_attr_setcreatesuspend_np;
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_pthread_attr_setdetachstate;
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_pthread_attr_setguardsize;
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_pthread_attr_setinheritsched;
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_pthread_attr_setschedparam;
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_pthread_attr_setschedpolicy;
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_pthread_attr_setscope;
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_pthread_attr_setstack;
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_pthread_attr_setstackaddr;
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_pthread_attr_setstacksize;
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_pthread_cancel;
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_pthread_cleanup_pop;
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_pthread_cleanup_push;
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_pthread_cond_broadcast;
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_pthread_cond_destroy;
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_pthread_cond_init;
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_pthread_cond_signal;
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_pthread_cond_timedwait;
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_pthread_cond_wait;
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_pthread_condattr_destroy;
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_pthread_condattr_getclock;
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_pthread_condattr_getpshared;
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_pthread_condattr_init;
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_pthread_condattr_setclock;
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_pthread_condattr_setpshared;
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_pthread_create;
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_pthread_detach;
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_pthread_equal;
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_pthread_exit;
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_pthread_getaffinity_np;
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_pthread_getconcurrency;
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_pthread_getcpuclockid;
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_pthread_getprio;
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_pthread_getschedparam;
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_pthread_getspecific;
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_pthread_join;
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_pthread_key_create;
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_pthread_key_delete;
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_pthread_kill;
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_pthread_main_np;
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_pthread_multi_np;
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_pthread_mutex_destroy;
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_pthread_mutex_getprioceiling;
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_pthread_mutex_getspinloops_np;
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_pthread_mutex_getyieldloops_np;
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_pthread_mutex_init;
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_pthread_mutex_init_calloc_cb;
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_pthread_mutex_isowned_np;
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_pthread_mutex_lock;
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_pthread_mutex_setprioceiling;
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_pthread_mutex_setspinloops_np;
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_pthread_mutex_setyieldloops_np;
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_pthread_mutex_timedlock;
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_pthread_mutex_trylock;
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_pthread_mutex_unlock;
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_pthread_mutexattr_destroy;
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_pthread_mutexattr_getkind_np;
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_pthread_mutexattr_getprioceiling;
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_pthread_mutexattr_getprotocol;
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_pthread_mutexattr_getpshared;
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_pthread_mutexattr_gettype;
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_pthread_mutexattr_init;
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_pthread_mutexattr_setkind_np;
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_pthread_mutexattr_setprioceiling;
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_pthread_mutexattr_setprotocol;
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_pthread_mutexattr_setpshared;
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_pthread_mutexattr_settype;
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_pthread_once;
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_pthread_resume_all_np;
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_pthread_resume_np;
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_pthread_rwlock_destroy;
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_pthread_rwlock_init;
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_pthread_rwlock_rdlock;
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_pthread_rwlock_timedrdlock;
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_pthread_rwlock_timedwrlock;
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_pthread_rwlock_tryrdlock;
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_pthread_rwlock_trywrlock;
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_pthread_rwlock_unlock;
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_pthread_rwlock_wrlock;
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_pthread_rwlockattr_destroy;
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_pthread_rwlockattr_getpshared;
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_pthread_rwlockattr_init;
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_pthread_rwlockattr_setpshared;
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_pthread_self;
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_pthread_set_name_np;
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_pthread_setaffinity_np;
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_pthread_setcancelstate;
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_pthread_setcanceltype;
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_pthread_setconcurrency;
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_pthread_setprio;
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_pthread_setschedparam;
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_pthread_setspecific;
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_pthread_sigmask;
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_pthread_single_np;
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_pthread_spin_destroy;
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_pthread_spin_init;
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_pthread_spin_lock;
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_pthread_spin_trylock;
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_pthread_spin_unlock;
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_pthread_suspend_all_np;
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_pthread_suspend_np;
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_pthread_switch_add_np;
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_pthread_switch_delete_np;
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_pthread_testcancel;
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_pthread_timedjoin_np;
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_pthread_yield;
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_raise;
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_sigaction;
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_sigprocmask;
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_sigsuspend;
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_sigtimedwait;
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_sigwait;
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_sigwaitinfo;
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_spinlock;
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_spinlock_debug;
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_spinunlock;
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/* Debugger needs these. */
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_libthr_debug;
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_thread_active_threads;
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_thread_bp_create;
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_thread_bp_death;
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_thread_event_mask;
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_thread_keytable;
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_thread_last_event;
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_thread_list;
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_thread_max_keys;
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_thread_off_attr_flags;
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_thread_off_dtv;
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_thread_off_event_buf;
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_thread_off_event_mask;
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_thread_off_key_allocated;
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_thread_off_key_destructor;
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_thread_off_linkmap;
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_thread_off_next;
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_thread_off_report_events;
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_thread_off_state;
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_thread_off_tcb;
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_thread_off_tid;
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_thread_off_tlsindex;
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_thread_size_key;
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_thread_state_running;
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_thread_state_zoombie;
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};
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FBSD_1.1 {
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__pthread_cleanup_pop_imp;
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__pthread_cleanup_push_imp;
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pthread_attr_getaffinity_np;
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pthread_attr_setaffinity_np;
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pthread_getaffinity_np;
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pthread_getcpuclockid;
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pthread_setaffinity_np;
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pthread_mutex_getspinloops_np;
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pthread_mutex_getyieldloops_np;
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pthread_mutex_isowned_np;
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pthread_mutex_setspinloops_np;
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pthread_mutex_setyieldloops_np;
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};
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FBSD_1.2 {
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openat;
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sem_destroy;
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sem_getvalue;
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sem_init;
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sem_post;
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sem_timedwait;
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sem_trywait;
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sem_wait;
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};
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