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Diffstat (limited to 'src/os_unix.c')
-rw-r--r--src/os_unix.c64
1 files changed, 37 insertions, 27 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index 927b9e1c5..a9c883a93 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -248,6 +248,7 @@ static pid_t randomnessPid = 0;
#define UNIXFILE_URI 0x40 /* Filename might have query parameters */
#define UNIXFILE_NOLOCK 0x80 /* Do no file locking */
#define UNIXFILE_WARNED 0x0100 /* verifyDbFile() warnings issued */
+#define UNIXFILE_BLOCK 0x0200 /* Next SHM lock might block */
/*
** Include code that is common to all os_*.c files
@@ -1535,7 +1536,7 @@ static int unixLock(sqlite3_file *id, int eFileLock){
OSTRACE(("LOCK %d %s was %s(%s,%d) pid=%d (unix)\n", pFile->h,
azFileLock(eFileLock), azFileLock(pFile->eFileLock),
azFileLock(pFile->pInode->eFileLock), pFile->pInode->nShared,
- osGetpid()));
+ osGetpid(0)));
/* If there is already a lock of this type or more restrictive on the
** unixFile, do nothing. Don't use the end_lock: exit path, as
@@ -1743,7 +1744,7 @@ static int posixUnlock(sqlite3_file *id, int eFileLock, int handleNFSUnlock){
assert( pFile );
OSTRACE(("UNLOCK %d %d was %d(%d,%d) pid=%d (unix)\n", pFile->h, eFileLock,
pFile->eFileLock, pFile->pInode->eFileLock, pFile->pInode->nShared,
- osGetpid()));
+ osGetpid(0)));
assert( eFileLock<=SHARED_LOCK );
if( pFile->eFileLock<=eFileLock ){
@@ -2170,7 +2171,7 @@ static int dotlockUnlock(sqlite3_file *id, int eFileLock) {
assert( pFile );
OSTRACE(("UNLOCK %d %d was %d pid=%d (dotlock)\n", pFile->h, eFileLock,
- pFile->eFileLock, osGetpid()));
+ pFile->eFileLock, osGetpid(0)));
assert( eFileLock<=SHARED_LOCK );
/* no-op if possible */
@@ -2388,7 +2389,7 @@ static int flockUnlock(sqlite3_file *id, int eFileLock) {
assert( pFile );
OSTRACE(("UNLOCK %d %d was %d pid=%d (flock)\n", pFile->h, eFileLock,
- pFile->eFileLock, osGetpid()));
+ pFile->eFileLock, osGetpid(0)));
assert( eFileLock<=SHARED_LOCK );
/* no-op if possible */
@@ -2556,7 +2557,7 @@ static int semXUnlock(sqlite3_file *id, int eFileLock) {
assert( pFile );
assert( pSem );
OSTRACE(("UNLOCK %d %d was %d pid=%d (sem)\n", pFile->h, eFileLock,
- pFile->eFileLock, osGetpid()));
+ pFile->eFileLock, osGetpid(0)));
assert( eFileLock<=SHARED_LOCK );
/* no-op if possible */
@@ -2770,7 +2771,7 @@ static int afpLock(sqlite3_file *id, int eFileLock){
assert( pFile );
OSTRACE(("LOCK %d %s was %s(%s,%d) pid=%d (afp)\n", pFile->h,
azFileLock(eFileLock), azFileLock(pFile->eFileLock),
- azFileLock(pInode->eFileLock), pInode->nShared , osGetpid()));
+ azFileLock(pInode->eFileLock), pInode->nShared , osGetpid(0)));
/* If there is already a lock of this type or more restrictive on the
** unixFile, do nothing. Don't use the afp_end_lock: exit path, as
@@ -2956,7 +2957,7 @@ static int afpUnlock(sqlite3_file *id, int eFileLock) {
assert( pFile );
OSTRACE(("UNLOCK %d %d was %d(%d,%d) pid=%d (afp)\n", pFile->h, eFileLock,
pFile->eFileLock, pFile->pInode->eFileLock, pFile->pInode->nShared,
- osGetpid()));
+ osGetpid(0)));
assert( eFileLock<=SHARED_LOCK );
if( pFile->eFileLock<=eFileLock ){
@@ -3781,6 +3782,10 @@ static int unixGetTempname(int nBuf, char *zBuf);
static int unixFileControl(sqlite3_file *id, int op, void *pArg){
unixFile *pFile = (unixFile*)id;
switch( op ){
+ case SQLITE_FCNTL_WAL_BLOCK: {
+ pFile->ctrlFlags |= UNIXFILE_BLOCK;
+ return SQLITE_OK;
+ }
case SQLITE_FCNTL_LOCKSTATE: {
*(int*)pArg = pFile->eFileLock;
return SQLITE_OK;
@@ -4090,15 +4095,17 @@ struct unixShm {
** otherwise.
*/
static int unixShmSystemLock(
- unixShmNode *pShmNode, /* Apply locks to this open shared-memory segment */
+ unixFile *pFile, /* Open connection to the WAL file */
int lockType, /* F_UNLCK, F_RDLCK, or F_WRLCK */
int ofst, /* First byte of the locking range */
int n /* Number of bytes to lock */
){
- struct flock f; /* The posix advisory locking structure */
- int rc = SQLITE_OK; /* Result code form fcntl() */
+ unixShmNode *pShmNode; /* Apply locks to this open shared-memory segment */
+ struct flock f; /* The posix advisory locking structure */
+ int rc = SQLITE_OK; /* Result code form fcntl() */
/* Access to the unixShmNode object is serialized by the caller */
+ pShmNode = pFile->pInode->pShmNode;
assert( sqlite3_mutex_held(pShmNode->mutex) || pShmNode->nRef==0 );
/* Shared locks never span more than one byte */
@@ -4108,6 +4115,7 @@ static int unixShmSystemLock(
assert( n>=1 && n<SQLITE_SHM_NLOCK );
if( pShmNode->h>=0 ){
+ int lkType;
/* Initialize the locking parameters */
memset(&f, 0, sizeof(f));
f.l_type = lockType;
@@ -4115,8 +4123,10 @@ static int unixShmSystemLock(
f.l_start = ofst;
f.l_len = n;
- rc = osFcntl(pShmNode->h, F_SETLK, &f);
+ lkType = (pFile->ctrlFlags & UNIXFILE_BLOCK)!=0 ? F_SETLKW : F_SETLK;
+ rc = osFcntl(pShmNode->h, lkType, &f);
rc = (rc!=(-1)) ? SQLITE_OK : SQLITE_BUSY;
+ pFile->ctrlFlags &= ~UNIXFILE_BLOCK;
}
/* Update the global lock state and do debug tracing */
@@ -4326,13 +4336,13 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
** If not, truncate the file to zero length.
*/
rc = SQLITE_OK;
- if( unixShmSystemLock(pShmNode, F_WRLCK, UNIX_SHM_DMS, 1)==SQLITE_OK ){
+ if( unixShmSystemLock(pDbFd, F_WRLCK, UNIX_SHM_DMS, 1)==SQLITE_OK ){
if( robust_ftruncate(pShmNode->h, 0) ){
rc = unixLogError(SQLITE_IOERR_SHMOPEN, "ftruncate", zShmFilename);
}
}
if( rc==SQLITE_OK ){
- rc = unixShmSystemLock(pShmNode, F_RDLCK, UNIX_SHM_DMS, 1);
+ rc = unixShmSystemLock(pDbFd, F_RDLCK, UNIX_SHM_DMS, 1);
}
if( rc ) goto shm_open_err;
}
@@ -4564,7 +4574,7 @@ static int unixShmLock(
/* Unlock the system-level locks */
if( (mask & allMask)==0 ){
- rc = unixShmSystemLock(pShmNode, F_UNLCK, ofst+UNIX_SHM_BASE, n);
+ rc = unixShmSystemLock(pDbFd, F_UNLCK, ofst+UNIX_SHM_BASE, n);
}else{
rc = SQLITE_OK;
}
@@ -4592,7 +4602,7 @@ static int unixShmLock(
/* Get shared locks at the system level, if necessary */
if( rc==SQLITE_OK ){
if( (allShared & mask)==0 ){
- rc = unixShmSystemLock(pShmNode, F_RDLCK, ofst+UNIX_SHM_BASE, n);
+ rc = unixShmSystemLock(pDbFd, F_RDLCK, ofst+UNIX_SHM_BASE, n);
}else{
rc = SQLITE_OK;
}
@@ -4617,7 +4627,7 @@ static int unixShmLock(
** also mark the local connection as being locked.
*/
if( rc==SQLITE_OK ){
- rc = unixShmSystemLock(pShmNode, F_WRLCK, ofst+UNIX_SHM_BASE, n);
+ rc = unixShmSystemLock(pDbFd, F_WRLCK, ofst+UNIX_SHM_BASE, n);
if( rc==SQLITE_OK ){
assert( (p->sharedMask & mask)==0 );
p->exclMask |= mask;
@@ -4626,7 +4636,7 @@ static int unixShmLock(
}
sqlite3_mutex_leave(pShmNode->mutex);
OSTRACE(("SHM-LOCK shmid-%d, pid-%d got %03x,%03x\n",
- p->id, osGetpid(), p->sharedMask, p->exclMask));
+ p->id, osGetpid(0), p->sharedMask, p->exclMask));
return rc;
}
@@ -5721,8 +5731,8 @@ static int unixOpen(
** the same instant might all reset the PRNG. But multiple resets
** are harmless.
*/
- if( randomnessPid!=osGetpid() ){
- randomnessPid = osGetpid();
+ if( randomnessPid!=osGetpid(0) ){
+ randomnessPid = osGetpid(0);
sqlite3_randomness(0,0);
}
@@ -6113,7 +6123,7 @@ static int unixRandomness(sqlite3_vfs *NotUsed, int nBuf, char *zBuf){
** tests repeatable.
*/
memset(zBuf, 0, nBuf);
- randomnessPid = osGetpid();
+ randomnessPid = osGetpid(0);
#if !defined(SQLITE_TEST)
{
int fd, got;
@@ -6434,7 +6444,7 @@ static int proxyGetLockPath(const char *dbPath, char *lPath, size_t maxLen){
{
if( !confstr(_CS_DARWIN_USER_TEMP_DIR, lPath, maxLen) ){
OSTRACE(("GETLOCKPATH failed %s errno=%d pid=%d\n",
- lPath, errno, osGetpid()));
+ lPath, errno, osGetpid(0)));
return SQLITE_IOERR_LOCK;
}
len = strlcat(lPath, "sqliteplocks", maxLen);
@@ -6456,7 +6466,7 @@ static int proxyGetLockPath(const char *dbPath, char *lPath, size_t maxLen){
}
lPath[i+len]='\0';
strlcat(lPath, ":auto:", maxLen);
- OSTRACE(("GETLOCKPATH proxy lock path=%s pid=%d\n", lPath, osGetpid()));
+ OSTRACE(("GETLOCKPATH proxy lock path=%s pid=%d\n", lPath, osGetpid(0)));
return SQLITE_OK;
}
@@ -6483,7 +6493,7 @@ static int proxyCreateLockPath(const char *lockPath){
if( err!=EEXIST ) {
OSTRACE(("CREATELOCKPATH FAILED creating %s, "
"'%s' proxy lock path=%s pid=%d\n",
- buf, strerror(err), lockPath, osGetpid()));
+ buf, strerror(err), lockPath, osGetpid(0)));
return err;
}
}
@@ -6492,7 +6502,7 @@ static int proxyCreateLockPath(const char *lockPath){
}
buf[i] = lockPath[i];
}
- OSTRACE(("CREATELOCKPATH proxy lock path=%s pid=%d\n", lockPath, osGetpid()));
+ OSTRACE(("CREATELOCKPATH proxy lock path=%s pid=%d\n", lockPath, osGetpid(0)));
return 0;
}
@@ -6798,7 +6808,7 @@ static int proxyTakeConch(unixFile *pFile){
OSTRACE(("TAKECONCH %d for %s pid=%d\n", conchFile->h,
(pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"),
- osGetpid()));
+ osGetpid(0)));
rc = proxyGetHostID(myHostID, &pError);
if( (rc&0xff)==SQLITE_IOERR ){
@@ -7008,7 +7018,7 @@ static int proxyReleaseConch(unixFile *pFile){
conchFile = pCtx->conchFile;
OSTRACE(("RELEASECONCH %d for %s pid=%d\n", conchFile->h,
(pCtx->lockProxyPath ? pCtx->lockProxyPath : ":auto:"),
- osGetpid()));
+ osGetpid(0)));
if( pCtx->conchHeld>0 ){
rc = conchFile->pMethod->xUnlock((sqlite3_file*)conchFile, NO_LOCK);
}
@@ -7150,7 +7160,7 @@ static int proxyTransformUnixFile(unixFile *pFile, const char *path) {
}
OSTRACE(("TRANSPROXY %d for %s pid=%d\n", pFile->h,
- (lockPath ? lockPath : ":auto:"), osGetpid()));
+ (lockPath ? lockPath : ":auto:"), osGetpid(0)));
pCtx = sqlite3_malloc( sizeof(*pCtx) );
if( pCtx==0 ){
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-20 16:41:26 +0000