diff options
Diffstat (limited to 'src/libmowgli/mowgli_spinlock.h')
-rw-r--r-- | src/libmowgli/mowgli_spinlock.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/libmowgli/mowgli_spinlock.h b/src/libmowgli/mowgli_spinlock.h new file mode 100644 index 0000000..6742e13 --- /dev/null +++ b/src/libmowgli/mowgli_spinlock.h @@ -0,0 +1,44 @@ +/* + * libmowgli: A collection of useful routines for programming. + * mowgli_spinlock.h: Spinlocks. + * + * Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice is present in all copies. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __MOWGLI_SPINLOCK_H__ +#define __MOWGLI_SPINLOCK_H__ + +typedef struct { + void *read_owner; /* opaque data representing a spinlock's owner */ + void *write_owner; /* opaque data representing a spinlock's owner */ +} mowgli_spinlock_t; + +typedef enum { + MOWGLI_SPINLOCK_READ, + MOWGLI_SPINLOCK_WRITE, + MOWGLI_SPINLOCK_READWRITE +} mowgli_spinlock_lock_param_t; + +extern mowgli_spinlock_t *mowgli_spinlock_create(void); +extern void mowgli_spinlock_lock(mowgli_spinlock_t *self, void *r, void *w); +extern void mowgli_spinlock_unlock(mowgli_spinlock_t *self, void *r, void *w); +extern void mowgli_spinlock_wait(mowgli_spinlock_t *self, mowgli_spinlock_lock_param_t param); +extern void mowgli_spinlock_timed_wait(mowgli_spinlock_t *self, mowgli_spinlock_lock_param_t param, struct timeval *tv); + +#endif |