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https://github.com/clearlinux/kvmtool.git
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Pekka Enberg
c0799eb9f2
The virtio_blk_do_io() function can enter the QCOW code through
disk_image__{read,write,flush}() from multiple threads because it uses a thread
pool for I/O requests. Thus, use locking to make the QCOW2 code thread-safe.
Cc: Asias He <asias.hejun@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
34 lines
755 B
C
34 lines
755 B
C
#ifndef KVM__MUTEX_H
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#define KVM__MUTEX_H
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#include <pthread.h>
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#include "kvm/util.h"
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/*
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* Kernel-alike mutex API - to make it easier for kernel developers
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* to write user-space code! :-)
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*/
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#define DEFINE_MUTEX(mutex) pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER
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static inline void mutex_init(pthread_mutex_t *mutex)
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{
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if (pthread_mutex_init(mutex, NULL) != 0)
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die("unexpected pthread_mutex_init() failure!");
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}
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static inline void mutex_lock(pthread_mutex_t *mutex)
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{
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if (pthread_mutex_lock(mutex) != 0)
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die("unexpected pthread_mutex_lock() failure!");
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}
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static inline void mutex_unlock(pthread_mutex_t *mutex)
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{
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if (pthread_mutex_unlock(mutex) != 0)
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die("unexpected pthread_mutex_unlock() failure!");
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}
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#endif /* KVM__MUTEX_H */
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