74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
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/* $NetBSD: smb_lock.c,v 1.1 2000/12/07 03:48:10 deberg Exp $ */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <netsmb/smb_lock.h>
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int
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simple_spinlock_init(struct simplespinlock *slp, char *name, int prio)
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{
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bzero(slp, sizeof(*slp));
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simple_lock_init(&slp->sl_interlock);
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slp->sl_name = name;
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prio = prio;
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return 0;
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}
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int
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simple_spinlock(struct simplespinlock *slp, int intr)
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{
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int flags = slp->sl_prio;
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int error;
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if (intr)
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flags |= PCATCH;
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try_again:
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simple_lock(&slp->sl_interlock);
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if (++slp->sl_count == 1) {
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simple_unlock(&slp->sl_interlock);
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return 0;
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}
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#ifndef NetBSD
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asleep(&slp->sl_count, flags, slp->sl_name, 0);
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simple_unlock(&slp->sl_interlock);
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error = await(flags, 0);
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#else
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simple_unlock(&slp->sl_interlock);
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error = tsleep(&slp->sl_count, flags, slp->sl_name, 0);
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#endif
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if (error) {
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simple_lock(&slp->sl_interlock);
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slp->sl_count--;
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simple_unlock(&slp->sl_interlock);
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if (error == ERESTART)
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error = EINTR;
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}
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#ifdef NetBSD
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else
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goto try_again;
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#endif
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return error;
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}
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void
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simple_spinunlock(struct simplespinlock *slp)
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{
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simple_lock(&slp->sl_interlock);
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if (slp->sl_count == 0)
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panic("spinunlock(): negative lock count\n");
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#ifndef NetBSD
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if (--slp->sl_count != 0)
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wakeup_one(&slp->sl_count);
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simple_unlock(&slp->sl_interlock);
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#else
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--slp->sl_count;
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simple_unlock(&slp->sl_interlock);
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if (slp->sl_count != 0)
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wakeup(&slp->sl_count);
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#endif
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return;
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}
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