29f66af8a0
Add a generic locking API for situations where multiple user-space processes and/or kernel drivers need to cooordinate access to a shared resource such as a graphics buffer. Change-Id: Ic0dedbad74b970d7bd1a6624a845b5b1b9847443 Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#ifndef _GENLOCK_H_
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#define _GENLOCK_H_
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#ifdef __KERNEL__
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struct genlock;
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struct genlock_handle;
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struct genlock_handle *genlock_get_handle(void);
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struct genlock_handle *genlock_get_handle_fd(int fd);
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void genlock_put_handle(struct genlock_handle *handle);
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struct genlock *genlock_create_lock(struct genlock_handle *);
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struct genlock *genlock_attach_lock(struct genlock_handle *, int fd);
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int genlock_wait(struct genlock_handle *handle, u32 timeout);
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void genlock_release_lock(struct genlock_handle *);
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int genlock_lock(struct genlock_handle *handle, int op, int flags,
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u32 timeout);
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#endif
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#define GENLOCK_UNLOCK 0
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#define GENLOCK_WRLOCK 1
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#define GENLOCK_RDLOCK 2
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#define GENLOCK_NOBLOCK (1 << 0)
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struct genlock_lock {
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int fd;
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int op;
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int flags;
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int timeout;
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};
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#define GENLOCK_IOC_MAGIC 'G'
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#define GENLOCK_IOC_NEW _IO(GENLOCK_IOC_MAGIC, 0)
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#define GENLOCK_IOC_EXPORT _IOR(GENLOCK_IOC_MAGIC, 1, \
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struct genlock_lock)
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#define GENLOCK_IOC_ATTACH _IOW(GENLOCK_IOC_MAGIC, 2, \
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struct genlock_lock)
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#define GENLOCK_IOC_LOCK _IOW(GENLOCK_IOC_MAGIC, 3, \
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struct genlock_lock)
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#define GENLOCK_IOC_RELEASE _IO(GENLOCK_IOC_MAGIC, 4)
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#define GENLOCK_IOC_WAIT _IOW(GENLOCK_IOC_MAGIC, 5, \
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struct genlock_lock)
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#endif
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