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fix potential race condition

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This commit is contained in:
Krasimir Angelov
2023-03-15 17:09:25 +01:00
parent 66e0511141
commit de5f027bde
1 changed files with 4 additions and 4 deletions
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8
src/runtime/c/pgf/db.cxx
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@@ -1733,6 +1733,10 @@ __forceinline bool AllClear(unsigned __int32 lock)
void PgfDB::lock(DB_scope_mode m) void PgfDB::lock(DB_scope_mode m)
{ {
// If another process has resized the file we must resize the map
if (mmap_size != ms->file_size)
resize_map(ms->file_size, m == WRITER_SCOPE);
if (m == READER_SCOPE) { if (m == READER_SCOPE) {
#ifndef _WIN32 #ifndef _WIN32
int res = pthread_rwlock_rdlock(&ms->rwlock); int res = pthread_rwlock_rdlock(&ms->rwlock);
@@ -1767,10 +1771,6 @@ void PgfDB::lock(DB_scope_mode m)
} }
#endif #endif
} }
// If another process has resized the file we must resize the map
if (mmap_size != ms->file_size)
resize_map(ms->file_size, m == WRITER_SCOPE);
} }
void PgfDB::unlock() void PgfDB::unlock()