lock sync state lazily
don't try to lock it until we actually read or write it. the idea is to not fail with SyncState * if we tried to load the state before selecting a non-existing mailbox. this is ok, because if the mailbox is missing, we obviously have no sync state pertaining to it, either. as a side effect, this allows simplifying an error path.
This commit is contained in:
parent
fb19d644f7
commit
f43617cd94
25
src/sync.c
25
src/sync.c
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@ -497,14 +497,11 @@ cancel_done( void *aux )
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svars->state[t] |= ST_CANCELED;
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if (svars->state[1-t] & ST_CANCELED) {
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if (svars->lfd >= 0) {
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if (svars->nfp) {
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Fclose( svars->nfp, 0 );
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Fclose( svars->jfp, 0 );
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sync_bail( svars );
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} else {
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/* Early failure during box selection. */
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sync_bail2( svars );
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}
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sync_bail( svars );
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}
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}
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@ -626,6 +623,8 @@ lock_state( sync_vars_t *svars )
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{
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struct flock lck;
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if (svars->lfd >= 0)
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return 1;
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memset( &lck, 0, sizeof(lck) );
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#if SEEK_SET != 0
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lck.l_whence = SEEK_SET;
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@ -641,6 +640,7 @@ lock_state( sync_vars_t *svars )
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error( "Error: channel :%s:%s-:%s:%s is locked\n",
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svars->chan->stores[M]->name, svars->orig_name[M], svars->chan->stores[S]->name, svars->orig_name[S] );
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close( svars->lfd );
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svars->lfd = -1;
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return 0;
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}
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return 1;
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@ -689,6 +689,8 @@ load_state( sync_vars_t *svars )
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char buf[128], buf1[64], buf2[64];
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if ((jfp = fopen( svars->dname, "r" ))) {
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if (!lock_state( svars ))
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goto jbail;
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debug( "reading sync state %s ...\n", svars->dname );
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line = 0;
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while (fgets( buf, sizeof(buf), jfp )) {
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@ -775,6 +777,8 @@ load_state( sync_vars_t *svars )
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svars->mmaxxuid = INT_MAX;
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line = 0;
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if ((jfp = fopen( svars->jname, "r" ))) {
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if (!lock_state( svars ))
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goto jbail;
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if (!stat( svars->nname, &st ) && fgets( buf, sizeof(buf), jfp )) {
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debug( "recovering journal ...\n" );
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if (!(t = strlen( buf )) || buf[t - 1] != '\n') {
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@ -936,6 +940,7 @@ sync_boxes( store_t *ctx[], const char *names[], channel_conf_t *chan,
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svars->ctx[0] = ctx[0];
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svars->ctx[1] = ctx[1];
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svars->chan = chan;
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svars->lfd = -1;
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svars->uidval[0] = svars->uidval[1] = -1;
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svars->srecadd = &svars->srecs;
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@ -995,7 +1000,7 @@ box_opened( int sts, void *aux )
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if (!(svars->state[1-t] & ST_SELECTED))
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return;
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if (!prepare_state( svars ) || !lock_state( svars )) {
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if (!prepare_state( svars )) {
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svars->ret = SYNC_FAIL;
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sync_bail2( svars );
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return;
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@ -1020,6 +1025,8 @@ box_opened( int sts, void *aux )
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return;
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}
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if (!lock_state( svars ))
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goto bail;
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if (!(svars->nfp = fopen( svars->nname, "w" ))) {
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sys_error( "Error: cannot create new sync state %s", svars->nname );
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goto bail;
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@ -1944,8 +1951,10 @@ sync_bail( sync_vars_t *svars )
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nsrec = srec->next;
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free( srec );
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}
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unlink( svars->lname );
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close( svars->lfd );
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if (svars->lfd >= 0) {
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unlink( svars->lname );
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close( svars->lfd );
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}
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sync_bail2( svars );
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}
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