database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-04-22 23:02:54 +03:00
Code

Remove volatile from latch API

Browse Source 
This was no longer useful since the latch functions use memory
barriers already, which are also compiler barriers, and volatile does
not help with cross-process access.

Discussion: https://www.postgresql.org/message-id/flat/20190218202511.qsfpuj5sy4dbezcw%40alap3.anarazel.de#18783c27d73e9e40009c82f6e0df0974
This commit is contained in:
Peter Eisentraut 2019-02-25 09:24:15 +01:00
parent 754b90f657
commit 278584b526
2 changed files with 17 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/backend/storage/ipc/latch.c
View File

@ -225,7 +225,7 @@ InitializeLatchSupport(void)
* Initialize a process-local latch.
*/
void
InitLatch(volatile Latch *latch)
InitLatch(Latch *latch)
{
latch->is_set = false;
latch->owner_pid = MyProcPid;
@ -257,7 +257,7 @@ InitLatch(volatile Latch *latch)
* process references to postmaster-private latches or WaitEventSets.
*/
void
InitSharedLatch(volatile Latch *latch)
InitSharedLatch(Latch *latch)
{
#ifdef WIN32
SECURITY_ATTRIBUTES sa;
@ -293,7 +293,7 @@ InitSharedLatch(volatile Latch *latch)
* as shared latches use SIGUSR1 for inter-process communication.
*/
void
OwnLatch(volatile Latch *latch)
OwnLatch(Latch *latch)
{
/* Sanity checks */
Assert(latch->is_shared);
@ -313,7 +313,7 @@ OwnLatch(volatile Latch *latch)
* Disown a shared latch currently owned by the current process.
*/
void
DisownLatch(volatile Latch *latch)
DisownLatch(Latch *latch)
{
Assert(latch->is_shared);
Assert(latch->owner_pid == MyProcPid);
@ -341,7 +341,7 @@ DisownLatch(volatile Latch *latch)
* we return all of them in one call, but we will return at least one.
*/
int
WaitLatch(volatile Latch *latch, int wakeEvents, long timeout,
WaitLatch(Latch *latch, int wakeEvents, long timeout,
uint32 wait_event_info)
{
return WaitLatchOrSocket(latch, wakeEvents, PGINVALID_SOCKET, timeout,
@ -366,7 +366,7 @@ WaitLatch(volatile Latch *latch, int wakeEvents, long timeout,
* WaitEventSet instead; that's more efficient.
*/
int
WaitLatchOrSocket(volatile Latch *latch, int wakeEvents, pgsocket sock,
WaitLatchOrSocket(Latch *latch, int wakeEvents, pgsocket sock,
long timeout, uint32 wait_event_info)
{
int ret = 0;
@ -381,7 +381,7 @@ WaitLatchOrSocket(volatile Latch *latch, int wakeEvents, pgsocket sock,
if (wakeEvents & WL_LATCH_SET)
AddWaitEventToSet(set, WL_LATCH_SET, PGINVALID_SOCKET,
(Latch *) latch, NULL);
latch, NULL);
/* Postmaster-managed callers must handle postmaster death somehow. */
Assert(!IsUnderPostmaster ||
@ -433,7 +433,7 @@ WaitLatchOrSocket(volatile Latch *latch, int wakeEvents, pgsocket sock,
* throwing an error is not a good idea.
*/
void
SetLatch(volatile Latch *latch)
SetLatch(Latch *latch)
{
#ifndef WIN32
pid_t owner_pid;
@ -516,7 +516,7 @@ SetLatch(volatile Latch *latch)
* the latch is set again before the WaitLatch call.
*/
void
ResetLatch(volatile Latch *latch)
ResetLatch(Latch *latch)
{
/* Only the owner should reset the latch */
Assert(latch->owner_pid == MyProcPid);

16
src/include/storage/latch.h
View File

@ -156,12 +156,12 @@ typedef struct WaitEventSet WaitEventSet;
* prototypes for functions in latch.c
*/
extern void InitializeLatchSupport(void);
extern void InitLatch(volatile Latch *latch);
extern void InitSharedLatch(volatile Latch *latch);
extern void OwnLatch(volatile Latch *latch);
extern void DisownLatch(volatile Latch *latch);
extern void SetLatch(volatile Latch *latch);
extern void ResetLatch(volatile Latch *latch);
extern void InitLatch(Latch *latch);
extern void InitSharedLatch(Latch *latch);
extern void OwnLatch(Latch *latch);
extern void DisownLatch(Latch *latch);
extern void SetLatch(Latch *latch);
extern void ResetLatch(Latch *latch);
extern WaitEventSet *CreateWaitEventSet(MemoryContext context, int nevents);
extern void FreeWaitEventSet(WaitEventSet *set);
@ -172,9 +172,9 @@ extern void ModifyWaitEvent(WaitEventSet *set, int pos, uint32 events, Latch *la
extern int WaitEventSetWait(WaitEventSet *set, long timeout,
WaitEvent *occurred_events, int nevents,
uint32 wait_event_info);
extern int WaitLatch(volatile Latch *latch, int wakeEvents, long timeout,
extern int WaitLatch(Latch *latch, int wakeEvents, long timeout,
uint32 wait_event_info);
extern int WaitLatchOrSocket(volatile Latch *latch, int wakeEvents,
extern int WaitLatchOrSocket(Latch *latch, int wakeEvents,
pgsocket sock, long timeout, uint32 wait_event_info);
/*