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Tweak reader_pid check

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Check again after acquiring rmutex. Avoids potential issue with
a duplicate pid coming in between initial check and rmutex.
This commit is contained in:
Howard Chu 2013-07-19 09:57:33 -07:00
parent b1dc72b6b5
commit de72c08660
1 changed files with 7 additions and 5 deletions
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12
libraries/liblmdb/mdb.c
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@ -8092,11 +8092,13 @@ int mdb_reader_check(MDB_env *env, int *dead)
if (mdb_pid_insert(pids, pid) == 0) {
if (mdb_reader_pid(env, Pidcheck, pid)) {
LOCK_MUTEX_R(env);
for (j=i; j<rdrs; j++)
if (mr[j].mr_pid == pid) {
mr[j].mr_pid = 0;
count++;
}
if (mdb_reader_pid(env, Pidcheck, pid)) {
for (j=i; j<rdrs; j++)
if (mr[j].mr_pid == pid) {
mr[j].mr_pid = 0;
count++;
}
}
UNLOCK_MUTEX_R(env);
}
}