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/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __NVGPU_COND_LINUX_H__
#define __NVGPU_COND_LINUX_H__
#include <linux/wait.h>
struct nvgpu_cond {
bool initialized;
wait_queue_head_t wq;
};
/**
* NVGPU_COND_WAIT - Wait for a condition to be true
*
* @c - The condition variable to sleep on
* @condition - The condition that needs to be true
* @timeout_ms - Timeout in milliseconds, or 0 for infinite wait
*
* Wait for a condition to become true. Returns -ETIMEOUT if
* the wait timed out with condition false.
*/
#define NVGPU_COND_WAIT(c, condition, timeout_ms) \
({\
int ret = 0; \
long _timeout_ms = timeout_ms;\
if (_timeout_ms > 0) { \
long _ret = wait_event_timeout((c)->wq, condition, \
msecs_to_jiffies(_timeout_ms)); \
if (_ret == 0) \
ret = -ETIMEDOUT; \
} else { \
wait_event((c)->wq, condition); \
} \
ret;\
})
/**
* NVGPU_COND_WAIT_INTERRUPTIBLE - Wait for a condition to be true
*
* @c - The condition variable to sleep on
* @condition - The condition that needs to be true
* @timeout_ms - Timeout in milliseconds, or 0 for infinite wait
*
* Wait for a condition to become true. Returns -ETIMEOUT if
* the wait timed out with condition false or -ERESTARTSYS on
* signal.
*/
#define NVGPU_COND_WAIT_INTERRUPTIBLE(c, condition, timeout_ms) \
({ \
int ret = 0; \
long _timeout_ms = timeout_ms;\
if (_timeout_ms > 0) { \
long _ret = wait_event_interruptible_timeout((c)->wq, condition, \
msecs_to_jiffies(_timeout_ms)); \
if (_ret == 0) \
ret = -ETIMEDOUT; \
else if (_ret == -ERESTARTSYS) \
ret = -ERESTARTSYS; \
} else { \
wait_event_interruptible((c)->wq, condition); \
} \
ret; \
})
#endif /* __NVGPU_LOCK_LINUX_H__ */
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