diff options
Diffstat (limited to 'libnetdata/locks/locks.c')
| -rw-r--r-- | libnetdata/locks/locks.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/libnetdata/locks/locks.c b/libnetdata/locks/locks.c new file mode 100644 index 0000000..91e2269 --- /dev/null +++ b/libnetdata/locks/locks.c @@ -0,0 +1,332 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "../libnetdata.h" + +// ---------------------------------------------------------------------------- +// automatic thread cancelability management, based on locks + +static __thread int netdata_thread_first_cancelability = 0; +static __thread int netdata_thread_lock_cancelability = 0; + +inline void netdata_thread_disable_cancelability(void) { + int old; + int ret = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old); + if(ret != 0) + error("THREAD_CANCELABILITY: pthread_setcancelstate() on thread %s returned error %d", netdata_thread_tag(), ret); + else { + if(!netdata_thread_lock_cancelability) + netdata_thread_first_cancelability = old; + + netdata_thread_lock_cancelability++; + } +} + +inline void netdata_thread_enable_cancelability(void) { + if(netdata_thread_lock_cancelability < 1) { + error("THREAD_CANCELABILITY: netdata_thread_enable_cancelability(): invalid thread cancelability count %d on thread %s - results will be undefined - please report this!", netdata_thread_lock_cancelability, netdata_thread_tag()); + } + else if(netdata_thread_lock_cancelability == 1) { + int old = 1; + int ret = pthread_setcancelstate(netdata_thread_first_cancelability, &old); + if(ret != 0) + error("THREAD_CANCELABILITY: pthread_setcancelstate() on thread %s returned error %d", netdata_thread_tag(), ret); + else { + if(old != PTHREAD_CANCEL_DISABLE) + error("THREAD_CANCELABILITY: netdata_thread_enable_cancelability(): old thread cancelability on thread %s was changed, expected DISABLED (%d), found %s (%d) - please report this!", netdata_thread_tag(), PTHREAD_CANCEL_DISABLE, (old == PTHREAD_CANCEL_ENABLE)?"ENABLED":"UNKNOWN", old); + } + + netdata_thread_lock_cancelability = 0; + } + else + netdata_thread_lock_cancelability--; +} + +// ---------------------------------------------------------------------------- +// mutex + +int __netdata_mutex_init(netdata_mutex_t *mutex) { + int ret = pthread_mutex_init(mutex, NULL); + if(unlikely(ret != 0)) + error("MUTEX_LOCK: failed to initialize (code %d).", ret); + return ret; +} + +int __netdata_mutex_lock(netdata_mutex_t *mutex) { + netdata_thread_disable_cancelability(); + + int ret = pthread_mutex_lock(mutex); + if(unlikely(ret != 0)) { + netdata_thread_enable_cancelability(); + error("MUTEX_LOCK: failed to get lock (code %d)", ret); + } + return ret; +} + +int __netdata_mutex_trylock(netdata_mutex_t *mutex) { + netdata_thread_disable_cancelability(); + + int ret = pthread_mutex_trylock(mutex); + if(ret != 0) + netdata_thread_enable_cancelability(); + + return ret; +} + +int __netdata_mutex_unlock(netdata_mutex_t *mutex) { + int ret = pthread_mutex_unlock(mutex); + if(unlikely(ret != 0)) + error("MUTEX_LOCK: failed to unlock (code %d).", ret); + else + netdata_thread_enable_cancelability(); + + return ret; +} + +int netdata_mutex_init_debug( const char *file, const char *function, const unsigned long line, netdata_mutex_t *mutex) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_init(0x%p) from %lu@%s, %s()", mutex, line, file, function); + } + + int ret = __netdata_mutex_init(mutex); + + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_init(0x%p) = %d in %llu usec, from %lu@%s, %s()", mutex, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_mutex_lock_debug( const char *file, const char *function, const unsigned long line, netdata_mutex_t *mutex) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_lock(0x%p) from %lu@%s, %s()", mutex, line, file, function); + } + + int ret = __netdata_mutex_lock(mutex); + + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_lock(0x%p) = %d in %llu usec, from %lu@%s, %s()", mutex, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_mutex_trylock_debug( const char *file, const char *function, const unsigned long line, netdata_mutex_t *mutex) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_trylock(0x%p) from %lu@%s, %s()", mutex, line, file, function); + } + + int ret = __netdata_mutex_trylock(mutex); + + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_trylock(0x%p) = %d in %llu usec, from %lu@%s, %s()", mutex, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_mutex_unlock_debug( const char *file, const char *function, const unsigned long line, netdata_mutex_t *mutex) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_unlock(0x%p) from %lu@%s, %s()", mutex, line, file, function); + } + + int ret = __netdata_mutex_unlock(mutex); + + debug(D_LOCKS, "MUTEX_LOCK: netdata_mutex_unlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", mutex, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + + +// ---------------------------------------------------------------------------- +// r/w lock + +int __netdata_rwlock_destroy(netdata_rwlock_t *rwlock) { + int ret = pthread_rwlock_destroy(rwlock); + if(unlikely(ret != 0)) + error("RW_LOCK: failed to destroy lock (code %d)", ret); + return ret; +} + +int __netdata_rwlock_init(netdata_rwlock_t *rwlock) { + int ret = pthread_rwlock_init(rwlock, NULL); + if(unlikely(ret != 0)) + error("RW_LOCK: failed to initialize lock (code %d)", ret); + return ret; +} + +int __netdata_rwlock_rdlock(netdata_rwlock_t *rwlock) { + netdata_thread_disable_cancelability(); + + int ret = pthread_rwlock_rdlock(rwlock); + if(unlikely(ret != 0)) { + netdata_thread_enable_cancelability(); + error("RW_LOCK: failed to obtain read lock (code %d)", ret); + } + + return ret; +} + +int __netdata_rwlock_wrlock(netdata_rwlock_t *rwlock) { + netdata_thread_disable_cancelability(); + + int ret = pthread_rwlock_wrlock(rwlock); + if(unlikely(ret != 0)) { + error("RW_LOCK: failed to obtain write lock (code %d)", ret); + netdata_thread_enable_cancelability(); + } + + return ret; +} + +int __netdata_rwlock_unlock(netdata_rwlock_t *rwlock) { + int ret = pthread_rwlock_unlock(rwlock); + if(unlikely(ret != 0)) + error("RW_LOCK: failed to release lock (code %d)", ret); + else + netdata_thread_enable_cancelability(); + + return ret; +} + +int __netdata_rwlock_tryrdlock(netdata_rwlock_t *rwlock) { + netdata_thread_disable_cancelability(); + + int ret = pthread_rwlock_tryrdlock(rwlock); + if(ret != 0) + netdata_thread_enable_cancelability(); + + return ret; +} + +int __netdata_rwlock_trywrlock(netdata_rwlock_t *rwlock) { + netdata_thread_disable_cancelability(); + + int ret = pthread_rwlock_trywrlock(rwlock); + if(ret != 0) + netdata_thread_enable_cancelability(); + + return ret; +} + + +int netdata_rwlock_destroy_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_destroy(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_destroy(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_destroy(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_init_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_init(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_init(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_init(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_rdlock_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_rdlock(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_rdlock(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_rdlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_wrlock_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_wrlock(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_wrlock(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_wrlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_unlock_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_unlock(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_unlock(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_unlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_tryrdlock_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_tryrdlock(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_tryrdlock(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_tryrdlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} + +int netdata_rwlock_trywrlock_debug( const char *file, const char *function, const unsigned long line, netdata_rwlock_t *rwlock) { + usec_t start = 0; + (void)start; + + if(unlikely(debug_flags & D_LOCKS)) { + start = now_boottime_usec(); + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_trywrlock(0x%p) from %lu@%s, %s()", rwlock, line, file, function); + } + + int ret = __netdata_rwlock_trywrlock(rwlock); + + debug(D_LOCKS, "RW_LOCK: netdata_rwlock_trywrlock(0x%p) = %d in %llu usec, from %lu@%s, %s()", rwlock, ret, now_boottime_usec() - start, line, file, function); + + return ret; +} |