diff options
Diffstat (limited to 'include/qemu/thread.h')
-rw-r--r-- | include/qemu/thread.h | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/include/qemu/thread.h b/include/qemu/thread.h index fb74e21..7eba27a 100644 --- a/include/qemu/thread.h +++ b/include/qemu/thread.h @@ -293,115 +293,4 @@ static inline void qemu_spin_unlock(QemuSpin *spin) #endif } -struct QemuLockCnt { -#ifndef CONFIG_LINUX - QemuMutex mutex; -#endif - unsigned count; -}; - -/** - * qemu_lockcnt_init: initialize a QemuLockcnt - * @lockcnt: the lockcnt to initialize - * - * Initialize lockcnt's counter to zero and prepare its mutex - * for usage. - */ -void qemu_lockcnt_init(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_destroy: destroy a QemuLockcnt - * @lockcnt: the lockcnt to destruct - * - * Destroy lockcnt's mutex. - */ -void qemu_lockcnt_destroy(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_inc: increment a QemuLockCnt's counter - * @lockcnt: the lockcnt to operate on - * - * If the lockcnt's count is zero, wait for critical sections - * to finish and increment lockcnt's count to 1. If the count - * is not zero, just increment it. - * - * Because this function can wait on the mutex, it must not be - * called while the lockcnt's mutex is held by the current thread. - * For the same reason, qemu_lockcnt_inc can also contribute to - * AB-BA deadlocks. This is a sample deadlock scenario: - * - * thread 1 thread 2 - * ------------------------------------------------------- - * qemu_lockcnt_lock(&lc1); - * qemu_lockcnt_lock(&lc2); - * qemu_lockcnt_inc(&lc2); - * qemu_lockcnt_inc(&lc1); - */ -void qemu_lockcnt_inc(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_dec: decrement a QemuLockCnt's counter - * @lockcnt: the lockcnt to operate on - */ -void qemu_lockcnt_dec(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_dec_and_lock: decrement a QemuLockCnt's counter and - * possibly lock it. - * @lockcnt: the lockcnt to operate on - * - * Decrement lockcnt's count. If the new count is zero, lock - * the mutex and return true. Otherwise, return false. - */ -bool qemu_lockcnt_dec_and_lock(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_dec_if_lock: possibly decrement a QemuLockCnt's counter and - * lock it. - * @lockcnt: the lockcnt to operate on - * - * If the count is 1, decrement the count to zero, lock - * the mutex and return true. Otherwise, return false. - */ -bool qemu_lockcnt_dec_if_lock(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_lock: lock a QemuLockCnt's mutex. - * @lockcnt: the lockcnt to operate on - * - * Remember that concurrent visits are not blocked unless the count is - * also zero. You can use qemu_lockcnt_count to check for this inside a - * critical section. - */ -void qemu_lockcnt_lock(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_unlock: release a QemuLockCnt's mutex. - * @lockcnt: the lockcnt to operate on. - */ -void qemu_lockcnt_unlock(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_inc_and_unlock: combined unlock/increment on a QemuLockCnt. - * @lockcnt: the lockcnt to operate on. - * - * This is the same as - * - * qemu_lockcnt_unlock(lockcnt); - * qemu_lockcnt_inc(lockcnt); - * - * but more efficient. - */ -void qemu_lockcnt_inc_and_unlock(QemuLockCnt *lockcnt); - -/** - * qemu_lockcnt_count: query a LockCnt's count. - * @lockcnt: the lockcnt to query. - * - * Note that the count can change at any time. Still, while the - * lockcnt is locked, one can usefully check whether the count - * is non-zero. - */ -unsigned qemu_lockcnt_count(QemuLockCnt *lockcnt); - #endif |