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mdbx: add mdbx_get_errno_checked().

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This commit is contained in:
Leo Yuriev
2017-05-15 12:08:04 +03:00
parent 533e01cc93
commit 00081298d6
3 changed files with 102 additions and 86 deletions
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61
src/lck-windows.c
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@@ -128,7 +128,7 @@ static __inline BOOL funlock(mdbx_filehandle_t fd, off_t offset, size_t bytes) {
int mdbx_txn_lock(MDB_env *env) {
if (flock(env->me_fd, LCK_EXCLUSIVE | LCK_WAITFOR, LCK_BODY))
return MDB_SUCCESS;
return GetLastError();
return mdbx_get_errno_checked();
}
void mdbx_txn_unlock(MDB_env *env) {
@@ -154,7 +154,7 @@ int mdbx_rdt_lock(MDB_env *env) {
/* transite from S-? (used) to S-E (locked), e.g. exlcusive lock upper-part */
if (flock(env->me_lfd, LCK_EXCLUSIVE | LCK_WAITFOR, LCK_UPPER))
return MDB_SUCCESS;
return GetLastError();
return mdbx_get_errno_checked();
}
void mdbx_rdt_unlock(MDB_env *env) {
@@ -195,7 +195,7 @@ static int internal_seize_lck(HANDLE lfd) {
/* 1) now on ?-? (free), get ?-E (middle) */
mdbx_jitter4testing(false);
if (!flock(lfd, LCK_EXCLUSIVE | LCK_WAITFOR, LCK_UPPER)) {
rc = GetLastError() /* 2) something went wrong, give up */;
rc = mdbx_get_errno_checked() /* 2) something went wrong, give up */;
mdbx_error("%s(%s) failed: errcode %u", mdbx_func_,
"?-?(free) >> ?-E(middle)", rc);
return rc;
@@ -207,22 +207,21 @@ static int internal_seize_lck(HANDLE lfd) {
return MDBX_RESULT_TRUE; /* 4) got E-E (exclusive), done */
/* 5) still on ?-E (middle) */
rc = GetLastError();
rc = mdbx_get_errno_checked();
mdbx_jitter4testing(false);
if (rc != ERROR_SHARING_VIOLATION && rc != ERROR_LOCK_VIOLATION) {
/* 6) something went wrong, give up */
if (!funlock(lfd, LCK_UPPER)) {
rc = GetLastError();
if (!funlock(lfd, LCK_UPPER))
mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
"?-E(middle) >> ?-?(free)", rc);
}
"?-E(middle) >> ?-?(free)", GetLastError());
return rc;
}
/* 7) still on ?-E (middle), try S-E (locked) */
mdbx_jitter4testing(false);
rc = flock(lfd, LCK_SHARED | LCK_DONTWAIT, LCK_LOWER) ? MDBX_RESULT_FALSE
: GetLastError();
rc = flock(lfd, LCK_SHARED | LCK_DONTWAIT, LCK_LOWER)
? MDBX_RESULT_FALSE
: mdbx_get_errno_checked();
mdbx_jitter4testing(false);
if (rc != MDBX_RESULT_FALSE)
@@ -231,11 +230,9 @@ static int internal_seize_lck(HANDLE lfd) {
/* 8) now on S-E (locked) or still on ?-E (middle),
* transite to S-? (used) or ?-? (free) */
if (!funlock(lfd, LCK_UPPER)) {
rc = GetLastError();
if (!funlock(lfd, LCK_UPPER))
mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
"X-E(locked/middle) >> X-?(used/free)", rc);
}
"X-E(locked/middle) >> X-?(used/free)", GetLastError());
/* 9) now on S-? (used, DONE) or ?-? (free, FAILURE) */
return rc;
@@ -249,7 +246,7 @@ int mdbx_lck_seize(MDB_env *env) {
/* LY: without-lck mode (e.g. on read-only filesystem) */
mdbx_jitter4testing(false);
if (!flock(env->me_fd, LCK_SHARED | LCK_DONTWAIT, LCK_WHOLE)) {
rc = GetLastError();
rc = mdbx_get_errno_checked();
mdbx_error("%s(%s) failed: errcode %u", mdbx_func_, "without-lck", rc);
return rc;
}
@@ -266,18 +263,16 @@ int mdbx_lck_seize(MDB_env *env) {
* - we can't lock meta-pages, otherwise other process could get an error
* while opening db in valid (non-conflict) mode. */
if (!flock(env->me_fd, LCK_EXCLUSIVE | LCK_DONTWAIT, LCK_BODY)) {
rc = GetLastError();
rc = mdbx_get_errno_checked();
mdbx_error("%s(%s) failed: errcode %u", mdbx_func_,
"lock-against-without-lck", rc);
mdbx_jitter4testing(false);
mdbx_lck_destroy(env);
} else {
mdbx_jitter4testing(false);
if (!funlock(env->me_fd, LCK_BODY)) {
rc = GetLastError();
if (!funlock(env->me_fd, LCK_BODY))
mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
"unlock-against-without-lck", rc);
}
"unlock-against-without-lck", GetLastError());
}
}
@@ -291,24 +286,20 @@ int mdbx_lck_downgrade(MDB_env *env) {
if (env->me_lfd != INVALID_HANDLE_VALUE) {
/* 1) must be at E-E (exclusive), transite to ?_E (middle) */
if (!funlock(env->me_lfd, LCK_LOWER)) {
rc = GetLastError();
if (!funlock(env->me_lfd, LCK_LOWER))
mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
"E-E(exclusive) >> ?-E(middle)", rc);
}
"E-E(exclusive) >> ?-E(middle)", GetLastError());
/* 2) now at ?-E (middle), transite to S-E (locked) */
if (!flock(env->me_lfd, LCK_SHARED | LCK_DONTWAIT, LCK_LOWER)) {
rc = GetLastError() /* 3) something went wrong, give up */;
rc = mdbx_get_errno_checked() /* 3) something went wrong, give up */;
return rc;
}
/* 4) got S-E (locked), continue transition to S-? (used) */
if (!funlock(env->me_lfd, LCK_UPPER)) {
rc = GetLastError();
if (!funlock(env->me_lfd, LCK_UPPER))
mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
"S-E(locked) >> S-?(used)", rc);
}
"S-E(locked) >> S-?(used)", GetLastError());
}
return MDB_SUCCESS /* 5) now at S-? (used), done */;
}
@@ -320,14 +311,14 @@ void mdbx_lck_destroy(MDB_env *env) {
/* double `unlock` for robustly remove overlapped shared/exclusive locks */
while (funlock(env->me_lfd, LCK_LOWER))
;
rc = GetLastError();
rc = mdbx_get_errno_checked();
assert(rc == ERROR_NOT_LOCKED);
(void)rc;
SetLastError(ERROR_SUCCESS);
while (funlock(env->me_lfd, LCK_UPPER))
;
rc = GetLastError();
rc = mdbx_get_errno_checked();
assert(rc == ERROR_NOT_LOCKED);
(void)rc;
SetLastError(ERROR_SUCCESS);
@@ -338,21 +329,21 @@ void mdbx_lck_destroy(MDB_env *env) {
* releases such locks via deferred queues) */
while (funlock(env->me_fd, LCK_BODY))
;
rc = GetLastError();
rc = mdbx_get_errno_checked();
assert(rc == ERROR_NOT_LOCKED);
(void)rc;
SetLastError(ERROR_SUCCESS);
while (funlock(env->me_fd, LCK_META))
;
rc = GetLastError();
rc = mdbx_get_errno_checked();
assert(rc == ERROR_NOT_LOCKED);
(void)rc;
SetLastError(ERROR_SUCCESS);
while (funlock(env->me_fd, LCK_WHOLE))
;
rc = GetLastError();
rc = mdbx_get_errno_checked();
assert(rc == ERROR_NOT_LOCKED);
(void)rc;
SetLastError(ERROR_SUCCESS);
@@ -386,7 +377,7 @@ int mdbx_rpid_check(MDB_env *env, mdbx_pid_t pid) {
rc = WaitForSingleObject(hProcess, 0);
CloseHandle(hProcess);
} else {
rc = GetLastError();
rc = mdbx_get_errno_checked();
}
switch (rc) {