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Introduce NEITHER_READ_NOR_WRITE in ctl.

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This is slightly clearer in meaning.  A function that is both READONLY() and
WRITEONLY() is in fact neither one.
This commit is contained in:
David Goldblatt 2020-01-22 14:59:28 -08:00 committed by David Goldblatt
parent 6a622867ca
commit d92f0175c7
1 changed files with 15 additions and 17 deletions
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32
src/ctl.c
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@ -1451,6 +1451,7 @@ ctl_mtx_assert_held(tsdn_t *tsdn) {
} \
} while (0)
/* Can read or write, but not both. */
#define READ_XOR_WRITE() do { \
if ((oldp != NULL && oldlenp != NULL) && (newp != NULL || \
newlen != 0)) { \
@ -1459,6 +1460,15 @@ ctl_mtx_assert_held(tsdn_t *tsdn) {
} \
} while (0)
/* Can neither read nor write. */
#define NEITHER_READ_NOR_WRITE() do { \
if (oldp != NULL || oldlenp != NULL || newp != NULL || \
newlen != 0) { \
ret = EPERM; \
goto label_return; \
} \
} while (0)
#define READ(v, t) do { \
if (oldp != NULL && oldlenp != NULL) { \
if (*oldlenp != sizeof(t)) { \
@ -1902,14 +1912,7 @@ thread_tcache_flush_ctl(tsd_t *tsd, const size_t *mib,
goto label_return;
}
/*
* Slightly counterintuitively, READONLY() really just requires that the
* call isn't trying to write, and WRITEONLY() just requires that it
* isn't trying to read; hence, adding both requires that the operation
* is neither a read nor a write.
*/
READONLY();
WRITEONLY();
NEITHER_READ_NOR_WRITE();
tcache_flush(tsd);
@ -1985,9 +1988,7 @@ thread_idle_ctl(tsd_t *tsd, const size_t *mib,
size_t newlen) {
int ret;
/* See the comment in thread_tcache_flush_ctl. */
READONLY();
WRITEONLY();
NEITHER_READ_NOR_WRITE();
if (tcache_available(tsd)) {
tcache_flush(tsd);
@ -2151,8 +2152,7 @@ arena_i_decay_ctl(tsd_t *tsd, const size_t *mib, size_t miblen, void *oldp,
int ret;
unsigned arena_ind;
READONLY();
WRITEONLY();
NEITHER_READ_NOR_WRITE();
MIB_UNSIGNED(arena_ind, 1);
arena_i_decay(tsd_tsdn(tsd), arena_ind, false);
@ -2167,8 +2167,7 @@ arena_i_purge_ctl(tsd_t *tsd, const size_t *mib, size_t miblen, void *oldp,
int ret;
unsigned arena_ind;
READONLY();
WRITEONLY();
NEITHER_READ_NOR_WRITE();
MIB_UNSIGNED(arena_ind, 1);
arena_i_decay(tsd_tsdn(tsd), arena_ind, true);
@ -2183,8 +2182,7 @@ arena_i_reset_destroy_helper(tsd_t *tsd, const size_t *mib, size_t miblen,
arena_t **arena) {
int ret;
READONLY();
WRITEONLY();
NEITHER_READ_NOR_WRITE();
MIB_UNSIGNED(*arena_ind, 1);
*arena = arena_get(tsd_tsdn(tsd), *arena_ind, false);