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Overview
| Comment: | Patch to the named semaphore locking mechanism used by VxWorks. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 609c5341bea16e4e8bcd15388b209c75 |
| User & Date: | drh 2009-08-27 17:56:21 |
Context
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2009-08-28
| ||
| 00:49 | Add a new source code logo gif. check-in: 6abcba10 user: drh tags: trunk | |
|
2009-08-27
| ||
| 17:56 | Patch to the named semaphore locking mechanism used by VxWorks. check-in: 609c5341 user: drh tags: trunk | |
|
2009-08-26
| ||
| 00:26 | Updates to the pluggable page cache documentation. check-in: 3085ad76 user: drh tags: trunk | |
Changes
Changes to src/os_unix.c.
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struct unixOpenCnt {
struct unixFileId fileId; /* The lookup key */
int nRef; /* Number of pointers to this structure */
int nLock; /* Number of outstanding locks */
UnixUnusedFd *pUnused; /* Unused file descriptors to close */
#if OS_VXWORKS
sem_t *pSem; /* Named POSIX semaphore */
char aSemName[MAX_PATHNAME+1]; /* Name of that semaphore */
#endif
struct unixOpenCnt *pNext, *pPrev; /* List of all unixOpenCnt objects */
};
/*
** Lists of all unixLockInfo and unixOpenCnt objects. These used to be hash
** tables. But the number of objects is rarely more than a dozen and
................................................................................
** included in the semLockingContext
*/
unixEnterMutex();
rc = findLockInfo(pNew, &pNew->pLock, &pNew->pOpen);
if( (rc==SQLITE_OK) && (pNew->pOpen->pSem==NULL) ){
char *zSemName = pNew->pOpen->aSemName;
int n;
sqlite3_snprintf(MAX_PATHNAME, zSemName, "%s.sem",
pNew->pId->zCanonicalName);
for( n=0; zSemName[n]; n++ )
if( zSemName[n]=='/' ) zSemName[n] = '_';
pNew->pOpen->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
if( pNew->pOpen->pSem == SEM_FAILED ){
rc = SQLITE_NOMEM;
pNew->pOpen->aSemName[0] = '\0';
}
}
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struct unixOpenCnt {
struct unixFileId fileId; /* The lookup key */
int nRef; /* Number of pointers to this structure */
int nLock; /* Number of outstanding locks */
UnixUnusedFd *pUnused; /* Unused file descriptors to close */
#if OS_VXWORKS
sem_t *pSem; /* Named POSIX semaphore */
char aSemName[MAX_PATHNAME+2]; /* Name of that semaphore */
#endif
struct unixOpenCnt *pNext, *pPrev; /* List of all unixOpenCnt objects */
};
/*
** Lists of all unixLockInfo and unixOpenCnt objects. These used to be hash
** tables. But the number of objects is rarely more than a dozen and
................................................................................
** included in the semLockingContext
*/
unixEnterMutex();
rc = findLockInfo(pNew, &pNew->pLock, &pNew->pOpen);
if( (rc==SQLITE_OK) && (pNew->pOpen->pSem==NULL) ){
char *zSemName = pNew->pOpen->aSemName;
int n;
sqlite3_snprintf(MAX_PATHNAME, zSemName, "/%s.sem",
pNew->pId->zCanonicalName);
for( n=1; zSemName[n]; n++ )
if( zSemName[n]=='/' ) zSemName[n] = '_';
pNew->pOpen->pSem = sem_open(zSemName, O_CREAT, 0666, 1);
if( pNew->pOpen->pSem == SEM_FAILED ){
rc = SQLITE_NOMEM;
pNew->pOpen->aSemName[0] = '\0';
}
}
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