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Add a new xShmBarrier method to the VFS - a shared-memory fence operation.

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Implement the same in both unix and win32.  Use it to make the WAL subsystem
more robust.

FossilOrigin-Name: 1bd011c9fed5ef29fb616b4d0a52df3b82221b1f
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drh
2010-05-20 23:51:06 +00:00
parent 7e263728f2
commit 286a288493
14 changed files with 135 additions and 41 deletions
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src/os.h
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@@ -248,6 +248,7 @@ int sqlite3OsShmSize(sqlite3_file *id, int, int*);
int sqlite3OsShmGet(sqlite3_file *id, int, int*, void volatile**);
int sqlite3OsShmRelease(sqlite3_file *id);
int sqlite3OsShmLock(sqlite3_file *id, int, int*);
void sqlite3OsShmBarrier(sqlite3_file *id);
int sqlite3OsShmClose(sqlite3_file *id, int);
/*