ISAR/libmdbx
3
0
Fork 0
mirror of https://github.com/isar/libmdbx.git synced 2025-02-01 04:08:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

mdbx-windows: fix and refine mdbx_suspend_threads_before_remap().

Browse Source 
Change-Id: I4f289f5d603ca18e6714455604dd4ce98931af41
This commit is contained in:
Leo Yuriev 2018-01-08 18:07:11 +03:00
parent 30bd7d3078
commit 59ad929d36
1 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
src/lck-windows.c
View File

@ -209,18 +209,17 @@ int mdbx_suspend_threads_before_remap(MDBX_env *env,
const MDBX_reader *const end = begin + env->me_lck->mti_numreaders;
const mdbx_tid_t WriteTxnOwner = env->me_txn0 ? env->me_txn0->mt_owner : 0;
for (const MDBX_reader *reader = begin; reader < end; ++reader) {
if (reader->mr_pid != env->me_pid || reader->mr_tid == CurrentTid ||
reader->mr_tid == WriteTxnOwner)
if (reader->mr_pid != env->me_pid || !reader->mr_tid) {
skip_lck:
continue;
}
if (reader->mr_tid == CurrentTid || reader->mr_tid == WriteTxnOwner)
goto skip_lck;
if (env->me_flags & MDBX_NOTLS) {
/* Skip duplicates in no-tls mode */
const MDBX_reader *scan = reader;
while (--scan >= begin)
for (const MDBX_reader *scan = reader; --scan >= begin;)
if (scan->mr_tid == reader->mr_tid)
break;
if (scan >= reader)
continue;
goto skip_lck;
}
rc = suspend_and_append(array, reader->mr_tid);
@ -238,17 +237,18 @@ int mdbx_suspend_threads_before_remap(MDBX_env *env,
} else {
/* Without LCK (i.e. read-only mode).
* Walk thougth a snapshot of all running threads */
const HANDLE hThreadSnap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (hThreadSnap == INVALID_HANDLE_VALUE)
mdbx_assert(env, env->me_txn0 == NULL);
const HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (hSnapshot == INVALID_HANDLE_VALUE)
return GetLastError();
THREADENTRY32 entry;
entry.dwSize = sizeof(THREADENTRY32);
if (!Thread32First(hThreadSnap, &entry)) {
if (!Thread32First(hSnapshot, &entry)) {
rc = GetLastError();
bailout_toolhelp:
CloseHandle(hThreadSnap);
CloseHandle(hSnapshot);
(void)mdbx_resume_threads_after_remap(*array);
return rc;
}
@ -262,11 +262,12 @@ int mdbx_suspend_threads_before_remap(MDBX_env *env,
if (rc != MDBX_SUCCESS)
goto bailout_toolhelp;
} while (Thread32Next(hThreadSnap, &entry));
} while (Thread32Next(hSnapshot, &entry));
rc = GetLastError();
if (rc != ERROR_NO_MORE_FILES)
goto bailout_toolhelp;
CloseHandle(hSnapshot);
}
return MDBX_SUCCESS;