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This commit is contained in:
Howard Chu 2011-09-22 04:34:40 -07:00
parent 4bcaabecf5
commit 54eb76cc7a
1 changed files with 5 additions and 2 deletions
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7
libraries/libmdb/mdb.c
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@ -439,9 +439,12 @@ typedef struct MDB_reader {
* For POSIX the actual mutexes reside in the shared memory of this * For POSIX the actual mutexes reside in the shared memory of this
* mapped file. On Windows, mutexes are named objects allocated by the * mapped file. On Windows, mutexes are named objects allocated by the
* kernel; we store the mutex names in this mapped file so that other * kernel; we store the mutex names in this mapped file so that other
* processes can grab them. This same approach will also be used on * processes can grab them. This same approach is also used on
* MacOSX/Darwin (using named semaphores) since MacOSX doesn't support * MacOSX/Darwin (using named semaphores) since MacOSX doesn't support
* process-shared POSIX mutexes. * process-shared POSIX mutexes. For these cases where a named object
* is used, the object name is derived from a 64 bit FNV hash of the
* environment pathname. As such, naming collisions are extremely
* unlikely. If a collision occurs, the results are unpredictable.
*/ */
typedef struct MDB_txbody { typedef struct MDB_txbody {
/** Stamp identifying this as an MDB lock file. It must be set /** Stamp identifying this as an MDB lock file. It must be set