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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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21
src/backend/storage/buffer/s_lock.c
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@@ -7,13 +7,14 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.12 1998/09/18 17:18:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.13 1998/12/15 12:46:21 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
#include "config.h"
#include "c.h"
@@ -52,6 +53,16 @@ s_lock_stuck(volatile slock_t *lock, const char *file, const int line)
}
void
s_lock_sleep(unsigned spin)
{
struct timeval delay;
delay.tv_sec = 0;
delay.tv_usec = s_spincycle[spin % S_NSPINCYCLE];
(void) select(0, NULL, NULL, NULL, &delay);
}
/*
* s_lock(lock) - take a spinlock with backoff
@@ -59,15 +70,11 @@ s_lock_stuck(volatile slock_t *lock, const char *file, const int line)
void
s_lock(volatile slock_t *lock, const char *file, const int line)
{
int spins = 0;
unsigned spins = 0;
while (TAS(lock))
{
struct timeval delay;
delay.tv_sec = 0;
delay.tv_usec = s_spincycle[spins % S_NSPINCYCLE];
(void) select(0, NULL, NULL, NULL, &delay);
s_lock_sleep(spins);
if (++spins > S_MAX_BUSY)
{
/* It's been over a minute... */