mirror of https://github.com/sqlite/sqlite
Clean up comments in os_unix.c. (CVS 2950)
FossilOrigin-Name: 2170e803ad48cffa6dddf8b591e0c085a7e66c86
This commit is contained in:
drh
parent
819d7f4735
commit
f1a221e695
14
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14
manifest
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@ -1,5 +1,5 @@
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C Correctly\sset\sthe\slength\sof\sthe\sstring\sin\sbytes\swhen\stransforming\san\sOP_String8\sto\sOP_String\sin\sa\sutf-16\svdbe\sprogram.\s(CVS\s2949)
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D 2006-01-15T14:11:49
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C Clean\sup\scomments\sin\sos_unix.c.\s(CVS\s2950)
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D 2006-01-15T17:27:18
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F Makefile.in ab3ffd8d469cef4477257169b82810030a6bb967
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F Makefile.linux-gcc aee18d8a05546dcf1888bd4547e442008a49a092
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F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
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@ -55,7 +55,7 @@ F src/os.h 9debc3d3ca4cdafde222a0ea74a4c8415aef4f22
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F src/os_common.h 6b76efa9b252e288de53b202ed5a0d48f48dc8db
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F src/os_test.c 49833426101f99aee4bb5f6a44b7c4b2029fda1c
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F src/os_test.h 903c93554c23d88f34f667f1979e4a1cee792af3
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F src/os_unix.c 7457d51c00337bf164eea7f10836d6e8a60b6b07
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F src/os_unix.c 7daa1720d46bbc31c6138462b35876650eb1885e
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F src/os_unix.h 5768d56d28240d3fe4537fac08cc85e4fb52279e
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F src/os_win.c cd4ca2753aeaad11f5c9b9b6ef28752f45ed4529
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F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
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@ -341,7 +341,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
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F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
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F www/version3.tcl a99cf5f6d8bd4d5537584a2b342f0fb9fa601d8b
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F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
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P 662522218f967a8fb07427a9abd53334bb1400f7
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R 52e0f590fc81537fea07a2566db609a5
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U danielk1977
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Z 32d89fdc432d236baf674d7c3f78a40f
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P 69f996e0fac1dc50b8c43d5fa132f79776843819
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R fe2dec729489d739f7bf82cb4fc6ed98
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U drh
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Z 6b80efaaf94d01c3e2f1cc2d8d444afa
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@ -1 +1 @@
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69f996e0fac1dc50b8c43d5fa132f79776843819
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2170e803ad48cffa6dddf8b591e0c085a7e66c86
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@ -19,7 +19,7 @@
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/*
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** These #defines should enable >2GB file support on Posix if the
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** underlying operating system supports it. If the OS lacks
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** large file support, or if the OS is windows, these should be no-ops.
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** large file support, these should be no-ops.
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**
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** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
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** on the compiler command line. This is necessary if you are compiling
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@ -28,8 +28,6 @@
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** without this option, LFS is enable. But LFS does not exist in the kernel
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** in RedHat 6.0, so the code won't work. Hence, for maximum binary
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** portability you should omit LFS.
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**
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** Similar is true for MacOS. LFS is only supported on MacOS 9 and later.
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*/
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#ifndef SQLITE_DISABLE_LFS
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# define _LARGE_FILE 1
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@ -51,10 +49,8 @@
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#include <errno.h>
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/*
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** Macros used to determine whether or not to use threads. The
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** SQLITE_UNIX_THREADS macro is defined if we are synchronizing for
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** Posix threads and SQLITE_W32_THREADS is defined if we are
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** synchronizing using Win32 threads.
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** If we are to be thread-safe, include the pthreads header and define
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** the SQLITE_UNIX_THREADS macro.
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*/
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#if defined(THREADSAFE) && THREADSAFE
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# include <pthread.h>
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@ -85,7 +81,7 @@ struct unixFile {
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unsigned char fullSync; /* Use F_FULLSYNC if available */
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int dirfd; /* File descriptor for the directory */
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#ifdef SQLITE_UNIX_THREADS
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pthread_t tid; /* The thread authorized to use this OsFile */
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pthread_t tid; /* The thread that "owns" this OsFile */
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#endif
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};
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@ -113,7 +109,7 @@ struct unixFile {
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/*
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** Do not include any of the File I/O interface procedures if the
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** SQLITE_OMIT_DISKIO macro is defined (indicating that there database
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** SQLITE_OMIT_DISKIO macro is defined (indicating that the database
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** will be in-memory only)
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*/
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#ifndef SQLITE_OMIT_DISKIO
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@ -164,6 +160,13 @@ struct unixFile {
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** means that sqlite3* database handles cannot be moved from one thread
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** to another. This logic makes sure a user does not try to do that
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** by mistake.
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**
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** Version 3.3.1 (2006-01-15): OsFiles can be moved from one thread to
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** another as long as we are running on a system that supports threads
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** overriding each others locks (which now the most common behavior)
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** or if no locks are held. But the OsFile.pLock field needs to be
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** recomputed because its key includes the thread-id. See the
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** transferOwnership() function below for additional information
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*/
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#if defined(SQLITE_UNIX_THREADS)
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# define SET_THREADID(X) (X)->tid = pthread_self()
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@ -280,8 +283,8 @@ struct unixFile {
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**
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** If threads cannot override each others locks, then we set the
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** lockKey.tid field to the thread ID. If threads can override
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** each others locks then tid is always set to zero. tid is also
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** set to zero if we compile without threading support.
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** each others locks then tid is always set to zero. tid is omitted
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** if we compile without threading support.
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*/
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struct lockKey {
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dev_t dev; /* Device number */
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@ -333,8 +336,9 @@ struct openCnt {
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};
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/*
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** These hash table maps inodes and process IDs into lockInfo and openCnt
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** structures. Access to these hash tables must be protected by a mutex.
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** These hash tables map inodes and file descriptors (really, lockKey and
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** openKey structures) into lockInfo and openCnt structures. Access to
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** these hash tables must be protected by a mutex.
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*/
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static Hash lockHash = { SQLITE_HASH_BINARY, 0, 0, 0, 0, 0 };
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static Hash openHash = { SQLITE_HASH_BINARY, 0, 0, 0, 0, 0 };
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@ -348,6 +352,10 @@ static Hash openHash = { SQLITE_HASH_BINARY, 0, 0, 0, 0, 0 };
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** 0: No. Threads cannot override each others locks.
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** 1: Yes. Threads can override each others locks.
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** -1: We don't know yet.
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**
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** This variable normally has file scope only. But during testing, we make
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** it a global so that the test code can change its value in order to verify
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** that the right stuff happens in either case.
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*/
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#ifdef SQLITE_TEST
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int threadsOverrideEachOthersLocks = -1;
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@ -372,7 +380,7 @@ struct threadTestData {
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** This routine is used for troubleshooting locks on multithreaded
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** platforms. Enable by compiling with the -DSQLITE_LOCK_TRACE
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** command-line option on the compiler. This code is normally
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** turnned off.
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** turned off.
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*/
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static int lockTrace(int fd, int op, struct flock *p){
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char *zOpName, *zType;
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@ -610,7 +618,7 @@ static const char *locktypeName(int locktype){
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**
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** Ownership transfer is only allowed if the unixFile is currently unlocked.
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** If the unixFile is locked and an ownership is wrong, then return
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** SQLITE_MISUSE. Otherwise return SQLITE_OK.
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** SQLITE_MISUSE. SQLITE_OK is returned if everything works.
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*/
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#ifdef SQLITE_UNIX_THREADS
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static int transferOwnership(unixFile *pFile){
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@ -640,6 +648,7 @@ static int transferOwnership(unixFile *pFile){
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return rc;
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}
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#else
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/* On single-threaded builds, ownership transfer is a no-op */
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# define transferOwnership(X) SQLITE_OK
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#endif
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@ -834,6 +843,8 @@ static int unixOpenDirectory(
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** If the following global variable points to a string which is the
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** name of a directory, then that directory will be used to store
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** temporary files.
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**
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** See also the "PRAGMA temp_store_directory" SQL command.
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*/
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char *sqlite3_temp_directory = 0;
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@ -1371,10 +1382,6 @@ end_lock:
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**
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** If the locking level of the file descriptor is already at or below
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** the requested locking level, this routine is a no-op.
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**
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** It is not possible for this routine to fail if the second argument
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** is NO_LOCK. If the second argument is SHARED_LOCK, this routine
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** might return SQLITE_IOERR instead of SQLITE_OK.
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*/
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static int unixUnlock(OsFile *id, int locktype){
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struct lockInfo *pLock;
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@ -1390,7 +1397,9 @@ static int unixUnlock(OsFile *id, int locktype){
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if( pFile->locktype<=locktype ){
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return SQLITE_OK;
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}
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if( CHECK_THREADID(pFile) ) return SQLITE_MISUSE;
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if( CHECK_THREADID(pFile) ){
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return SQLITE_MISUSE;
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}
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sqlite3OsEnterMutex();
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pLock = pFile->pLock;
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assert( pLock->cnt!=0 );
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@ -1616,7 +1625,7 @@ int sqlite3UnixRandomSeed(char *zBuf){
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** in the random seed.
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**
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** When testing, initializing zBuf[] to zero is all we do. That means
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** that we always use the same random number sequence.* This makes the
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** that we always use the same random number sequence. This makes the
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** tests repeatable.
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*/
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memset(zBuf, 0, 256);
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@ -1641,6 +1650,7 @@ int sqlite3UnixRandomSeed(char *zBuf){
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/*
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** Sleep for a little while. Return the amount of time slept.
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** The argument is the number of milliseconds we want to sleep.
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*/
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int sqlite3UnixSleep(int ms){
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#if defined(HAVE_USLEEP) && HAVE_USLEEP
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@ -1667,6 +1677,8 @@ static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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**
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** SQLite uses only a single Mutex. There is not much critical
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** code and what little there is executes quickly and without blocking.
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**
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** This mutex is not recursive.
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*/
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void sqlite3UnixEnterMutex(){
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#ifdef SQLITE_UNIX_THREADS
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@ -1712,9 +1724,9 @@ int sqlite3_tsd_count = 0;
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/*
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** If called with allocateFlag>1, then return a pointer to thread
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** If called with allocateFlag>0, then return a pointer to thread
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** specific data for the current thread. Allocate and zero the
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** thread-specific data if it does not already exist necessary.
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** thread-specific data if it does not already exist.
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**
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** If called with allocateFlag==0, then check the current thread
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** specific data. Return it if it exists. If it does not exist,
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