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Revert "Revert "libgenlock: add support for genlock_write_to_read locking semantics""

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This reverts commit b419ca44a137f8f5bc9b80412c7a6459583addab.
This commit is contained in:
Sudhir Sharma 2012-05-21 11:45:48 -07:00 committed by Andrew Sutherland
parent 7c05f8ce9d
commit 5e6e965be7
2 changed files with 49 additions and 4 deletions
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44
libgenlock/genlock.cpp
View File

@ -62,7 +62,7 @@ namespace {
/* Internal function to perform the actual lock/unlock operations */
genlock_status_t perform_lock_unlock_operation(native_handle_t *buffer_handle,
int lockType, int timeout)
int lockType, int timeout, int flags)
{
if (private_handle_t::validate(buffer_handle)) {
LOGE("%s: handle is invalid", __FUNCTION__);
@ -79,10 +79,21 @@ namespace {
genlock_lock lock;
lock.op = lockType;
lock.flags = 0;
lock.flags = flags;
lock.timeout = timeout;
lock.fd = hnd->genlockHandle;
#ifdef GENLOCK_IOC_DREADLOCK
if (ioctl(hnd->genlockPrivFd, GENLOCK_IOC_DREADLOCK, &lock)) {
LOGE("%s: GENLOCK_IOC_DREADLOCK failed (lockType0x%x, err=%s fd=%d)", __FUNCTION__,
lockType, strerror(errno), hnd->fd);
if (ETIMEDOUT == errno)
return GENLOCK_TIMEDOUT;
return GENLOCK_FAILURE;
}
#else
// depreciated
if (ioctl(hnd->genlockPrivFd, GENLOCK_IOC_LOCK, &lock)) {
LOGE("%s: GENLOCK_IOC_LOCK failed (lockType0x%x, err=%s fd=%d)", __FUNCTION__,
lockType, strerror(errno), hnd->fd);
@ -91,6 +102,7 @@ namespace {
return GENLOCK_FAILURE;
}
#endif
}
return GENLOCK_NO_ERROR;
}
@ -269,7 +281,7 @@ genlock_status_t genlock_lock_buffer(native_handle_t *buffer_handle,
LOGW("%s: trying to lock a buffer with timeout = 0", __FUNCTION__);
}
// Call the private function to perform the lock operation specified.
ret = perform_lock_unlock_operation(buffer_handle, kLockType, timeout);
ret = perform_lock_unlock_operation(buffer_handle, kLockType, timeout, 0);
#endif
return ret;
}
@ -287,7 +299,7 @@ genlock_status_t genlock_unlock_buffer(native_handle_t *buffer_handle)
#ifdef USE_GENLOCK
// Do the unlock operation by setting the unlock flag. Timeout is always
// 0 in this case.
ret = perform_lock_unlock_operation(buffer_handle, GENLOCK_UNLOCK, 0);
ret = perform_lock_unlock_operation(buffer_handle, GENLOCK_UNLOCK, 0, 0);
#endif
return ret;
}
@ -327,3 +339,27 @@ genlock_status_t genlock_wait(native_handle_t *buffer_handle, int timeout) {
#endif
return GENLOCK_NO_ERROR;
}
/*
* Convert a write lock that we own to a read lock
*
* @param: handle of the buffer
* @param: timeout value for the wait.
* return: error status.
*/
genlock_status_t genlock_write_to_read(native_handle_t *buffer_handle, int timeout) {
genlock_status_t ret = GENLOCK_NO_ERROR;
#ifdef USE_GENLOCK
if (0 == timeout) {
LOGW("%s: trying to lock a buffer with timeout = 0", __FUNCTION__);
}
// Call the private function to perform the lock operation specified.
#ifdef GENLOCK_IOC_DREADLOCK
ret = perform_lock_unlock_operation(buffer_handle, GENLOCK_RDLOCK, timeout, GENLOCK_WRITE_TO_READ);
#else
// depreciated
ret = perform_lock_unlock_operation(buffer_handle, GENLOCK_RDLOCK, timeout, 0);
#endif
#endif
return ret;
}

9
libgenlock/genlock.h
View File

@ -111,6 +111,15 @@ genlock_status_t genlock_unlock_buffer(native_handle_t *buffer_handle);
*/
genlock_status_t genlock_wait(native_handle_t *buffer_handle, int timeout);
/*
* Convert a write lock that we own to a read lock
*
* @param: handle of the buffer
* @param: timeout value for the wait.
* return: error status.
*/
genlock_status_t genlock_write_to_read(native_handle_t *buffer_handle, int timeout);
#ifdef __cplusplus
}
#endif