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porting to version 15 and minor improvements to version 14#33

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Merged
dlepikhova merged 1 commit intomasterfromPGPRO-5278-2
Oct 29, 2021
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11 changes: 0 additions & 11 deletionspatches/custom_signals_14.0.patch
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Original file line numberDiff line numberDiff line change
@@ -1,14 +1,3 @@
From f2632ea7cd03119c55b8aa0ef60f529380ca2536 Mon Sep 17 00:00:00 2001
From: Kovalenko Anastasia <s2180445@gse.cs.msu.ru>
Date: Tue, 24 Aug 2021 16:22:28 +0300
Subject: [PATCH] custom-signals

---
src/backend/storage/ipc/procsignal.c | 94 ++++++++++++++++++++++++++++
src/backend/tcop/postgres.c | 2 +
src/include/storage/procsignal.h | 17 +++++
3 files changed, 113 insertions(+)

diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index defb75a..4245d28 100644
--- a/src/backend/storage/ipc/procsignal.c
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206 changes: 206 additions & 0 deletionspatches/custom_signals_15.0.patch
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,206 @@
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index defb75a..4245d28 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -95,6 +95,13 @@ typedef struct
#define BARRIER_CLEAR_BIT(flags, type) \
((flags) &= ~(((uint32) 1) << (uint32) (type)))

+#define IsCustomProcSignalReason(reason) \
+((reason) >= PROCSIG_CUSTOM_1 && (reason) <= PROCSIG_CUSTOM_N)
+
+static bool CustomSignalPendings[NUM_CUSTOM_PROCSIGNALS];
+static bool CustomSignalProcessing[NUM_CUSTOM_PROCSIGNALS];
+static ProcSignalHandler_type CustomInterruptHandlers[NUM_CUSTOM_PROCSIGNALS];
+
static ProcSignalHeader *ProcSignal = NULL;
static ProcSignalSlot *MyProcSignalSlot = NULL;

@@ -103,6 +110,8 @@ static void CleanupProcSignalState(int status, Datum arg);
static void ResetProcSignalBarrierBits(uint32 flags);
static bool ProcessBarrierPlaceholder(void);

+static void CheckAndSetCustomSignalInterrupts(void);
+
/*
* ProcSignalShmemSize
*Compute space needed for procsignal's shared memory
@@ -246,6 +255,36 @@ CleanupProcSignalState(int status, Datum arg)
slot->pss_pid = 0;
}

+/*
+ * RegisterCustomProcSignalHandler
+ *Assign specific handler of custom process signal with new
+ *ProcSignalReason key.
+ *
+ * This function has to be called in _PG_init function of extensions at the
+ * stage of loading shared preloaded libraries. Otherwise it throws fatal error.
+ *
+ * Return INVALID_PROCSIGNAL if all slots for custom signals are occupied.
+ */
+ProcSignalReason
+RegisterCustomProcSignalHandler(ProcSignalHandler_type handler)
+{
+ProcSignalReason reason;
+
+if (!process_shared_preload_libraries_in_progress)
+ereport(FATAL, (errcode(ERRCODE_INTERNAL_ERROR),
+errmsg("cannot register custom signal after startup")));
+
+/* Iterate through custom signal slots to find a free one */
+for (reason = PROCSIG_CUSTOM_1; reason <= PROCSIG_CUSTOM_N; reason++)
+if (!CustomInterruptHandlers[reason - PROCSIG_CUSTOM_1])
+{
+CustomInterruptHandlers[reason - PROCSIG_CUSTOM_1] = handler;
+return reason;
+}
+
+return INVALID_PROCSIGNAL;
+}
+
/*
* SendProcSignal
*Send a signal to a Postgres process
@@ -679,7 +718,62 @@ procsignal_sigusr1_handler(SIGNAL_ARGS)
if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_BUFFERPIN))
RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_BUFFERPIN);

+CheckAndSetCustomSignalInterrupts();
+
SetLatch(MyLatch);

errno = save_errno;
}
+
+/*
+ * Handle receipt of an interrupt indicating any of custom process signals.
+ */
+static void
+CheckAndSetCustomSignalInterrupts()
+{
+ProcSignalReasonreason;
+
+for (reason = PROCSIG_CUSTOM_1; reason <= PROCSIG_CUSTOM_N; reason++)
+{
+if (CheckProcSignal(reason))
+{
+
+/* set interrupt flags */
+InterruptPending = true;
+CustomSignalPendings[reason - PROCSIG_CUSTOM_1] = true;
+}
+}
+
+SetLatch(MyLatch);
+}
+
+/*
+ * CheckAndHandleCustomSignals
+ *Check custom signal flags and call handler assigned to that signal
+ *if it is not NULL
+ *
+ * This function is called within CHECK_FOR_INTERRUPTS if interrupt occurred.
+ */
+void
+CheckAndHandleCustomSignals(void)
+{
+int i;
+
+/* Check on expiring of custom signals and call its handlers if exist */
+for (i = 0; i < NUM_CUSTOM_PROCSIGNALS; i++)
+{
+if (!CustomSignalProcessing[i] && CustomSignalPendings[i])
+{
+ProcSignalHandler_type handler;
+
+CustomSignalPendings[i] = false;
+handler = CustomInterruptHandlers[i];
+if (handler != NULL)
+{
+CustomSignalProcessing[i] = true;
+handler();
+CustomSignalProcessing[i] = false;
+}
+}
+}
+}
\ No newline at end of file
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 8cea10c..dd77c98 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -3364,6 +3364,8 @@ ProcessInterrupts(void)
if (ParallelMessagePending)
HandleParallelMessages();

+CheckAndHandleCustomSignals();
+
if (LogMemoryContextPending)
ProcessLogMemoryContextInterrupt();
}
diff --git a/src/include/storage/procsignal.h b/src/include/storage/procsignal.h
index eec186b..74af186 100644
--- a/src/include/storage/procsignal.h
+++ b/src/include/storage/procsignal.h
@@ -17,6 +17,8 @@
#include "storage/backendid.h"


+#define NUM_CUSTOM_PROCSIGNALS 64
+
/*
* Reasons for signaling a Postgres child process (a backend or an auxiliary
* process, like checkpointer). We can cope with concurrent signals for different
@@ -29,6 +31,8 @@
*/
typedef enum
{
+INVALID_PROCSIGNAL = -1,/* Must be first */
+
PROCSIG_CATCHUP_INTERRUPT,/* sinval catchup interrupt */
PROCSIG_NOTIFY_INTERRUPT,/* listen/notify interrupt */
PROCSIG_PARALLEL_MESSAGE,/* message from cooperating parallel backend */
@@ -44,6 +48,14 @@ typedef enum
PROCSIG_RECOVERY_CONFLICT_BUFFERPIN,
PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK,

+PROCSIG_CUSTOM_1,
+/*
+ * PROCSIG_CUSTOM_2,
+ * ...,
+ * PROCSIG_CUSTOM_N-1,
+ */
+PROCSIG_CUSTOM_N = PROCSIG_CUSTOM_1 + NUM_CUSTOM_PROCSIGNALS - 1,
+
NUM_PROCSIGNALS/* Must be last! */
} ProcSignalReason;

@@ -56,6 +68,8 @@ typedef enum
*/
PROCSIGNAL_BARRIER_PLACEHOLDER = 0
} ProcSignalBarrierType;
+/* Handler of custom process signal */
+typedef void (*ProcSignalHandler_type) (void);

/*
* prototypes for functions in procsignal.c
@@ -64,12 +78,15 @@ extern Size ProcSignalShmemSize(void);
extern void ProcSignalShmemInit(void);

extern void ProcSignalInit(int pss_idx);
+extern ProcSignalReason
+RegisterCustomProcSignalHandler(ProcSignalHandler_type handler);
extern intSendProcSignal(pid_t pid, ProcSignalReason reason,
BackendId backendId);

extern uint64 EmitProcSignalBarrier(ProcSignalBarrierType type);
extern void WaitForProcSignalBarrier(uint64 generation);
extern void ProcessProcSignalBarrier(void);
+extern void CheckAndHandleCustomSignals(void);

extern void procsignal_sigusr1_handler(SIGNAL_ARGS);

--
2.25.1

10 changes: 0 additions & 10 deletionspatches/runtime_explain_14.0.patch
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Original file line numberDiff line numberDiff line change
@@ -1,13 +1,3 @@
From 71a353d4cac663db43c57452f925082a233c0e49 Mon Sep 17 00:00:00 2001
From: Kovalenko Anastasia <s2180445@gse.cs.msu.ru>
Date: Mon, 23 Aug 2021 15:29:59 +0300
Subject: [PATCH] runtime-explain

---
src/backend/commands/explain.c | 153 ++++++++++++++++++++++++++++-----
src/include/commands/explain.h | 2 +
2 files changed, 133 insertions(+), 22 deletions(-)

diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 10644dfac4..7106ed4257 100644
--- a/src/backend/commands/explain.c
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