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Code Releases Activity

Also lock memory during LV updates.

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This commit is contained in:
Alasdair Kergon 2003-01-03 21:10:28 +00:00
parent 4086fb2620
commit 4e268ceacb
1 changed files with 23 additions and 2 deletions
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25
lib/locking/locking.c
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@ -14,18 +14,30 @@
#include <signal.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <limits.h>
static struct locking_type _locking;
static sigset_t _oldset;
static int _lock_count = 0; /* Number of locks held */
static int _write_lock_held = 0;
static int _signals_blocked = 0;
static void _block_signals(void)
static void _block_signals(int flags)
{
sigset_t set;
if (!_write_lock_held && (flags & LCK_SCOPE_MASK) == LCK_LV &&
(flags & LCK_TYPE_MASK) == LCK_WRITE) {
if (mlockall(MCL_CURRENT | MCL_FUTURE))
log_sys_error("mlockall", "");
else {
log_very_verbose("Locking memory");
_write_lock_held = 1;
}
}
if (_signals_blocked)
return;
@ -46,6 +58,15 @@ static void _block_signals(void)
static void _unblock_signals(void)
{
if (!_lock_count && _write_lock_held) {
if (munlockall()) {
log_very_verbose("Unlocking memory");
log_sys_error("munlockall", "");
}
_write_lock_held = 0;
}
/* Don't unblock signals while any locks are held */
if (!_signals_blocked || _lock_count)
return;
@ -149,7 +170,7 @@ int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname)
*/
static int _lock_vol(struct cmd_context *cmd, const char *resource, int flags)
{
_block_signals();
_block_signals(flags);
if (!(_locking.lock_resource(cmd, resource, flags))) {
_unblock_signals();