| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #ifndef NETDATA_SPINLOCK_H |
| 4 | #define NETDATA_SPINLOCK_H |
| 5 | |
| 6 | #include "libnetdata/common.h" |
| 7 | |
| 8 | #ifdef SPINLOCK_IMPL_WITH_MUTEX |
| 9 | typedef struct netdata_spinlock |
| 10 | { |
| 11 | netdata_mutex_t inner; |
| 12 | } SPINLOCK; |
| 13 | #else |
| 14 | typedef struct netdata_spinlock |
| 15 | { |
| 16 | bool locked; |
| 17 | #ifdef NETDATA_INTERNAL_CHECKS |
| 18 | pid_t locker_pid; |
| 19 | size_t spins; |
| 20 | #endif |
| 21 | } SPINLOCK; |
| 22 | #endif |
| 23 | |
| 24 | #ifdef SPINLOCK_IMPL_WITH_MUTEX |
| 25 | #define SPINLOCK_INITIALIZER { .inner = PTHREAD_MUTEX_INITIALIZER } |
| 26 | |
| 27 | #define spinlock_lock(spinlock) netdata_mutex_lock(&((spinlock)->inner)) |
| 28 | #define spinlock_unlock(spinlock) netdata_mutex_unlock(&((spinlock)->inner)) |
| 29 | #define spinlock_trylock(spinlock) (netdata_mutex_trylock(&((spinlock)->inner)) == 0) |
| 30 | #define spinlock_init(spinlock) netdata_mutex_init(&((spinlock)->inner) |
| 31 | #else |
| 32 | #ifdef NETDATA_INTERNAL_CHECKS |
| 33 | #define SPINLOCK_INITIALIZER { .locked = false, .locker_pid = 0, .spins = 0 } |
| 34 | #else |
| 35 | #define SPINLOCK_INITIALIZER { .locked = false } |
| 36 | #endif |
| 37 | |
| 38 | #define SPINLOCK_DEADLOCK_TIMEOUT_SEC 3600 // Number of seconds to wait before declaring a deadlock |
| 39 | #define SPINS_BEFORE_DEADLOCK_CHECK 100000 |
| 40 | |
| 41 | // Helper function to detect deadlocks |
| 42 | void spinlock_deadlock_detect(usec_t *timestamp, const char *type, const char *func); |
| 43 | |
| 44 | void spinlock_init_with_trace(SPINLOCK *spinlock, const char *func); |
| 45 | #define spinlock_init(spinlock) spinlock_init_with_trace(spinlock, __FUNCTION__) |
| 46 | |
| 47 | void spinlock_lock_with_trace(SPINLOCK *spinlock, const char *func); |
| 48 | #define spinlock_lock(spinlock) spinlock_lock_with_trace(spinlock, __FUNCTION__) |
| 49 | |
| 50 | void spinlock_unlock_with_trace(SPINLOCK *spinlock, const char *func __maybe_unused); |
| 51 | #define spinlock_unlock(spinlock) spinlock_unlock_with_trace(spinlock, __FUNCTION__) |
| 52 | |
| 53 | bool spinlock_trylock_with_trace(SPINLOCK *spinlock, const char *func __maybe_unused); |
| 54 | #define spinlock_trylock(spinlock) spinlock_trylock_with_trace(spinlock, __FUNCTION__) |
| 55 | |
| 56 | #endif |
| 57 | |
| 58 | #endif //NETDATA_SPINLOCK_H |