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Fix a race condition in the locking code that would sometimes cause

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SQLITE_PROTOCOL or SQLITE_CORRUPT to be returned when SQLITE_BUSY should
have been returned. (CVS 326)

FossilOrigin-Name: b0d218876442187af08161d989e6887b1cb4130c
This commit is contained in:
drh
2001-12-14 15:09:55 +00:00
parent 6a6cfb9b31
commit a7fcb05988
8 changed files with 267 additions and 228 deletions
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26
src/os.h
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@@ -25,6 +25,7 @@
struct OsFile {
struct lockInfo *pLock; /* Information about locks on this inode */
int fd; /* The file descriptor */
int locked; /* True if this user holds the lock */
};
# define SQLITE_TEMPNAME_SIZE 200
# if defined(HAVE_USLEEP) && HAVE_USLEEP
@@ -37,7 +38,11 @@
#if OS_WIN
#include <windows.h>
#include <winbase.h>
typedef HANDLE OsFile;
typedef struct OsFile OsFile;
struct OsFile {
HANDLE h;
int locked;
};
# define SQLITE_TEMPNAME_SIZE (MAX_PATH+50)
# define SQLITE_MIN_SLEEP_MS 1
#endif
@@ -48,15 +53,16 @@ int sqliteOsOpenReadWrite(const char*, OsFile*, int*);
int sqliteOsOpenExclusive(const char*, OsFile*);
int sqliteOsOpenReadOnly(const char*, OsFile*);
int sqliteOsTempFileName(char*);
int sqliteOsClose(OsFile);
int sqliteOsRead(OsFile, void*, int amt);
int sqliteOsWrite(OsFile, const void*, int amt);
int sqliteOsSeek(OsFile, int offset);
int sqliteOsSync(OsFile);
int sqliteOsTruncate(OsFile, int size);
int sqliteOsFileSize(OsFile, int *pSize);
int sqliteOsLock(OsFile, int wrlock);
int sqliteOsUnlock(OsFile);
int sqliteOsClose(OsFile*);
int sqliteOsRead(OsFile*, void*, int amt);
int sqliteOsWrite(OsFile*, const void*, int amt);
int sqliteOsSeek(OsFile*, int offset);
int sqliteOsSync(OsFile*);
int sqliteOsTruncate(OsFile*, int size);
int sqliteOsFileSize(OsFile*, int *pSize);
int sqliteOsReadLock(OsFile*);
int sqliteOsWriteLock(OsFile*);
int sqliteOsUnlock(OsFile*);
int sqliteOsRandomSeed(char*);
int sqliteOsSleep(int ms);
void sqliteOsEnterMutex(void);