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pipe.c
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#include "postgres.h"
#include "funcapi.h"
#include "fmgr.h"
#if PG_VERSION_NUM >= 90300
#include "access/htup_details.h"
#endif
#include "storage/shmem.h"
#include "utils/memutils.h"
#include "utils/timestamp.h"
#include "storage/lwlock.h"
#include "miscadmin.h"
#include "string.h"
#include "lib/stringinfo.h"
#include "catalog/pg_type.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/numeric.h"
#include "shmmc.h"
#include "pipe.h"
#include "orafce.h"
#include "builtins.h"
/*
* @ Pavel Stehule 2006
*/
#ifndef _GetCurrentTimestamp
#define _GetCurrentTimestamp() GetCurrentTimestamp()
#endif
#ifndef GetNowFloat
#ifdef HAVE_INT64_TIMESTAMP
#define GetNowFloat() ((float8) _GetCurrentTimestamp() / 1000000.0)
#else
#define GetNowFloat() _GetCurrentTimestamp()
#endif
#endif
#define RESULT_DATA 0
#define RESULT_WAIT 1
#define NOT_INITIALIZED -1
#define ONE_YEAR (60*60*24*365)
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_text);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_text);
PG_FUNCTION_INFO_V1(dbms_pipe_send_message);
PG_FUNCTION_INFO_V1(dbms_pipe_receive_message);
PG_FUNCTION_INFO_V1(dbms_pipe_unique_session_name);
PG_FUNCTION_INFO_V1(dbms_pipe_list_pipes);
PG_FUNCTION_INFO_V1(dbms_pipe_next_item_type);
PG_FUNCTION_INFO_V1(dbms_pipe_create_pipe);
PG_FUNCTION_INFO_V1(dbms_pipe_create_pipe_2);
PG_FUNCTION_INFO_V1(dbms_pipe_create_pipe_1);
PG_FUNCTION_INFO_V1(dbms_pipe_reset_buffer);
PG_FUNCTION_INFO_V1(dbms_pipe_purge);
PG_FUNCTION_INFO_V1(dbms_pipe_remove_pipe);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_date);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_date);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_timestamp);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_timestamp);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_number);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_number);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_bytea);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_bytea);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_record);
PG_FUNCTION_INFO_V1(dbms_pipe_unpack_message_record);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_integer);
PG_FUNCTION_INFO_V1(dbms_pipe_pack_message_bigint);
typedef enum {
IT_NO_MORE_ITEMS = 0,
IT_NUMBER = 9,
IT_VARCHAR = 11,
IT_DATE = 12,
IT_TIMESTAMPTZ = 13,
IT_BYTEA = 23,
IT_RECORD = 24
} message_data_type;
typedef struct _queue_item {
void *ptr;
struct _queue_item *next_item;
} queue_item;
typedef struct {
bool is_valid;
bool registered;
char *pipe_name;
char *creator;
Oid uid;
struct _queue_item *items;
int16 count;
int16 limit;
int size;
} pipe;
typedef struct {
int32 size;
message_data_type type;
Oid tupType;
} message_data_item;
typedef struct {
int32 size;
int32 items_count;
message_data_item *next;
} message_buffer;
#define message_buffer_size (MAXALIGN(sizeof(message_buffer)))
#define message_buffer_get_content(buf) ((message_data_item *) (((char*)buf)+message_buffer_size))
#define message_data_item_size (MAXALIGN(sizeof(message_data_item)))
#define message_data_get_content(msg) (((char *)msg) + message_data_item_size)
#define message_data_item_next(msg) \
((message_data_item *) (message_data_get_content(msg) + MAXALIGN(msg->size)))
typedef struct PipesFctx {
int pipe_nth;
} PipesFctx;
typedef struct
{
LWLockId shmem_lock;
pipe *pipes;
alert_event *events;
alert_lock *locks;
size_t size;
unsigned int sid;
vardata data[1]; /* flexible array member */
} sh_memory;
#define sh_memory_size (offsetof(sh_memory, data))
message_buffer *output_buffer = NULL;
message_buffer *input_buffer = NULL;
pipe* pipes = NULL;
#if PG_VERSION_NUM >= 90400
LWLockId shmem_lock = NULL;
#else
#define NOT_INITIALIZED -1
LWLockId shmem_lock = NOT_INITIALIZED;
#endif
unsigned int sid; /* session id */
extern alert_event *events;
extern alert_lock *locks;
/*
* write on writer size bytes from ptr
*/
static void
pack_field(message_buffer *buffer, message_data_type type,
int32 size, void *ptr, Oid tupType)
{
int len;
message_data_item *message;
len = MAXALIGN(size) + message_data_item_size;
if (MAXALIGN(buffer->size) + len > LOCALMSGSZ - message_buffer_size)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory"),
errdetail("Packed message is bigger than local buffer."),
errhint("Increase LOCALMSGSZ in 'pipe.h' and recompile library.")));
if (buffer->next == NULL)
buffer->next = message_buffer_get_content(buffer);
message = buffer->next;
message->size = size;
message->type = type;
message->tupType = tupType;
/* padding bytes have to be zeroed - buffer creator is responsible to clear memory */
memcpy(message_data_get_content(message), ptr, size);
buffer->size += len;
buffer->items_count++;
buffer->next = message_data_item_next(message);
}
static void*
unpack_field(message_buffer *buffer, message_data_type *type,
int32 *size, Oid *tupType)
{
void *ptr;
message_data_item *message;
Assert(buffer != NULL);
Assert(buffer->items_count > 0);
Assert(buffer->next != NULL);
message = buffer->next;
*size = message->size;
*type = message->type;
*tupType = message->tupType;
ptr = message_data_get_content(message);
buffer->next = --buffer->items_count > 0 ? message_data_item_next(message) : NULL;
return ptr;
}
/*
* Add ptr to queue. If pipe doesn't exist, register new pipe
*/
bool
ora_lock_shmem(size_t size, int max_pipes, int max_events, int max_locks, bool reset)
{
int i;
bool found;
sh_memory *sh_mem;
if (pipes == NULL)
{
sh_mem = ShmemInitStruct("dbms_pipe", size, &found);
if (sh_mem == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory"),
errdetail("Failed while allocation block %lu bytes in shared memory.", (unsigned long) size)));
if (!found)
{
#if PG_VERSION_NUM >= 90600
shmem_lock = sh_mem->shmem_lock = &(GetNamedLWLockTranche("orafce"))->lock;
#else
shmem_lock = sh_mem->shmem_lock = LWLockAssign();
#endif
LWLockAcquire(sh_mem->shmem_lock, LW_EXCLUSIVE);
sh_mem->size = size - sh_memory_size;
ora_sinit(sh_mem->data, size, true);
pipes = sh_mem->pipes = ora_salloc(max_pipes*sizeof(pipe));
sid = sh_mem->sid = 1;
for (i = 0; i < max_pipes; i++)
pipes[i].is_valid = false;
events = sh_mem->events = ora_salloc(max_events*sizeof(alert_event));
locks = sh_mem->locks = ora_salloc(max_locks*sizeof(alert_lock));
for (i = 0; i < max_events; i++)
{
events[i].event_name = NULL;
events[i].max_receivers = 0;
events[i].receivers = NULL;
events[i].messages = NULL;
}
for (i = 0; i < max_locks; i++)
{
locks[i].sid = -1;
locks[i].echo = NULL;
}
}
else if (sh_mem->shmem_lock != 0)
{
pipes = sh_mem->pipes;
shmem_lock = sh_mem->shmem_lock;
LWLockAcquire(sh_mem->shmem_lock, LW_EXCLUSIVE);
ora_sinit(sh_mem->data, sh_mem->size, reset);
sid = ++(sh_mem->sid);
events = sh_mem->events;
locks = sh_mem->locks;
}
}
else
{
LWLockAcquire(shmem_lock, LW_EXCLUSIVE);
}
/*
if (reset && pipes == NULL)
elog(ERROR, "Can't purge memory");
*/
return pipes != NULL;
}
/*
* can be enhanced access/hash.h
*/
static pipe*
find_pipe(text* pipe_name, bool* created, bool only_check)
{
int i;
pipe *result = NULL;
*created = false;
for (i = 0; i < MAX_PIPES; i++)
{
if (pipes[i].is_valid &&
strncmp((char*)VARDATA(pipe_name), pipes[i].pipe_name, VARSIZE(pipe_name) - VARHDRSZ) == 0
&& (strlen(pipes[i].pipe_name) == (VARSIZE(pipe_name) - VARHDRSZ)))
{
/* check owner if non public pipe */
if (pipes[i].creator != NULL && pipes[i].uid != GetUserId())
{
LWLockRelease(shmem_lock);
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("insufficient privilege"),
errdetail("Insufficient privilege to access pipe")));
}
return &pipes[i];
}
}
if (only_check)
return result;
for (i = 0; i < MAX_PIPES; i++)
if (!pipes[i].is_valid)
{
if (NULL != (pipes[i].pipe_name = ora_scstring(pipe_name)))
{
pipes[i].is_valid = true;
pipes[i].registered = false;
pipes[i].creator = NULL;
pipes[i].uid = -1;
pipes[i].count = 0;
pipes[i].limit = -1;
*created = true;
result = &pipes[i];
}
break;
}
return result;
}
static bool
new_last(pipe *p, void *ptr)
{
queue_item *q, *aux_q;
if (p->count >= p->limit && p->limit != -1)
return false;
if (p->items == NULL)
{
if (NULL == (p->items = ora_salloc(sizeof(queue_item))))
return false;
p->items->next_item = NULL;
p->items->ptr = ptr;
p->count = 1;
return true;
}
q = p->items;
while (q->next_item != NULL)
q = q->next_item;
if (NULL == (aux_q = ora_salloc(sizeof(queue_item))))
return false;
q->next_item = aux_q;
aux_q->next_item = NULL;
aux_q->ptr = ptr;
p->count += 1;
return true;
}
static void*
remove_first(pipe *p, bool *found)
{
struct _queue_item *q;
void *ptr = NULL;
*found = false;
if (NULL != (q = p->items))
{
p->count -= 1;
ptr = q->ptr;
p->items = q->next_item;
*found = true;
ora_sfree(q);
if (p->items == NULL && !p->registered)
{
ora_sfree(p->pipe_name);
p->is_valid = false;
}
}
return ptr;
}
/* copy message to local memory, if exists */
static message_buffer*
get_from_pipe(text *pipe_name, bool *found)
{
pipe *p;
bool created;
message_buffer *shm_msg;
message_buffer *result = NULL;
if (!ora_lock_shmem(SHMEMMSGSZ, MAX_PIPES, MAX_EVENTS, MAX_LOCKS, false))
return NULL;
if (NULL != (p = find_pipe(pipe_name, &created,false)))
{
if (!created)
{
if (NULL != (shm_msg = remove_first(p, found)))
{
p->size -= shm_msg->size;
result = (message_buffer*) MemoryContextAlloc(TopMemoryContext, shm_msg->size);
memcpy(result, shm_msg, shm_msg->size);
ora_sfree(shm_msg);
}
}
}
LWLockRelease(shmem_lock);
return result;
}
/*
* if ptr is null, then only register pipe
*/
static bool
add_to_pipe(text *pipe_name, message_buffer *ptr, int limit, bool limit_is_valid)
{
pipe *p;
bool created;
bool result = false;
message_buffer *sh_ptr;
if (!ora_lock_shmem(SHMEMMSGSZ, MAX_PIPES, MAX_EVENTS, MAX_LOCKS,false))
return false;
for (;;)
{
if (NULL != (p = find_pipe(pipe_name, &created, false)))
{
if (created)
p->registered = ptr == NULL;
if (limit_is_valid && (created || (p->limit < limit)))
p->limit = limit;
if (ptr != NULL)
{
if (NULL != (sh_ptr = ora_salloc(ptr->size)))
{
memcpy(sh_ptr,ptr,ptr->size);
if (new_last(p, sh_ptr))
{
p->size += ptr->size;
result = true;
break;
}
ora_sfree(sh_ptr);
}
if (created)
{
/* I created new pipe, but haven't memory for new value */
ora_sfree(p->pipe_name);
p->is_valid = false;
result = false;
}
}
else
result = true;
}
break;
}
LWLockRelease(shmem_lock);
return result;
}
static void
remove_pipe(text *pipe_name, bool purge)
{
pipe *p;
bool created;
if (NULL != (p = find_pipe(pipe_name, &created, true)))
{
queue_item *q = p->items;
while (q != NULL)
{
queue_item *aux_q;
aux_q = q->next_item;
if (q->ptr)
ora_sfree(q->ptr);
ora_sfree(q);
q = aux_q;
}
p->items = NULL;
p->size = 0;
p->count = 0;
if (!(purge && p->registered))
{
ora_sfree(p->pipe_name);
p->is_valid = false;
}
}
}
Datum
dbms_pipe_next_item_type (PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(input_buffer != NULL ? input_buffer->next->type : IT_NO_MORE_ITEMS);
}
static void
init_buffer(message_buffer *buffer, int32 size)
{
memset(buffer, 0, size);
buffer->size = message_buffer_size;
buffer->items_count = 0;
buffer->next = message_buffer_get_content(buffer);
}
static message_buffer*
check_buffer(message_buffer *buffer, int32 size)
{
if (buffer == NULL)
{
buffer = (message_buffer*) MemoryContextAlloc(TopMemoryContext, size);
if (buffer == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory"),
errdetail("Failed while allocation block %d bytes in memory.", size)));
init_buffer(buffer, size);
}
return buffer;
}
Datum
dbms_pipe_pack_message_text(PG_FUNCTION_ARGS)
{
text *str = PG_GETARG_TEXT_PP(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_VARCHAR,
VARSIZE_ANY_EXHDR(str), VARDATA_ANY(str), InvalidOid);
PG_RETURN_VOID();
}
Datum
dbms_pipe_pack_message_date(PG_FUNCTION_ARGS)
{
DateADT dt = PG_GETARG_DATEADT(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_DATE,
sizeof(dt), &dt, InvalidOid);
PG_RETURN_VOID();
}
Datum
dbms_pipe_pack_message_timestamp(PG_FUNCTION_ARGS)
{
TimestampTz dt = PG_GETARG_TIMESTAMPTZ(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_TIMESTAMPTZ,
sizeof(dt), &dt, InvalidOid);
PG_RETURN_VOID();
}
Datum
dbms_pipe_pack_message_number(PG_FUNCTION_ARGS)
{
Numeric num = PG_GETARG_NUMERIC(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_NUMBER,
VARSIZE(num) - VARHDRSZ, VARDATA(num), InvalidOid);
PG_RETURN_VOID();
}
Datum
dbms_pipe_pack_message_bytea(PG_FUNCTION_ARGS)
{
bytea *data = PG_GETARG_BYTEA_P(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_BYTEA,
VARSIZE_ANY_EXHDR(data), VARDATA_ANY(data), InvalidOid);
PG_RETURN_VOID();
}
/*
* We can serialize only typed record
*/
Datum
dbms_pipe_pack_message_record(PG_FUNCTION_ARGS)
{
HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
Oid tupType;
bytea *data;
FunctionCallInfoData info;
tupType = HeapTupleHeaderGetTypeId(rec);
/*
* Normally one would call record_send() using DirectFunctionCall3,
* but that does not work since record_send wants to cache some data
* using fcinfo->flinfo->fn_extra. So we need to pass it our own
* flinfo parameter.
*/
InitFunctionCallInfoData(info, fcinfo->flinfo, 3, InvalidOid, NULL, NULL);
info.arg[0] = PointerGetDatum(rec);
info.arg[1] = ObjectIdGetDatum(tupType);
info.arg[2] = Int32GetDatum(-1);
info.argnull[0] = false;
info.argnull[1] = false;
info.argnull[2] = false;
data = (bytea*) DatumGetPointer(record_send(&info));
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
pack_field(output_buffer, IT_RECORD,
VARSIZE(data), VARDATA(data), tupType);
PG_RETURN_VOID();
}
static Datum
dbms_pipe_unpack_message(PG_FUNCTION_ARGS, message_data_type dtype)
{
Oid tupType;
void *ptr;
message_data_type type;
int32 size;
Datum result;
message_data_type next_type;
if (input_buffer == NULL ||
input_buffer->items_count <= 0 ||
input_buffer->next == NULL ||
input_buffer->next->type == IT_NO_MORE_ITEMS)
PG_RETURN_NULL();
next_type = input_buffer->next->type;
if (next_type != dtype)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("datatype mismatch"),
errdetail("unpack unexpected type: %d", next_type)));
ptr = unpack_field(input_buffer, &type, &size, &tupType);
Assert(ptr != NULL);
switch (type)
{
case IT_TIMESTAMPTZ:
result = TimestampTzGetDatum(*(TimestampTz*)ptr);
break;
case IT_DATE:
result = DateADTGetDatum(*(DateADT*)ptr);
break;
case IT_VARCHAR:
case IT_NUMBER:
case IT_BYTEA:
result = PointerGetDatum(cstring_to_text_with_len(ptr, size));
break;
case IT_RECORD:
{
FunctionCallInfoData info;
StringInfoData buf;
text *data = cstring_to_text_with_len(ptr, size);
buf.data = VARDATA(data);
buf.len = VARSIZE(data) - VARHDRSZ;
buf.maxlen = buf.len;
buf.cursor = 0;
/*
* Normally one would call record_recv() using DirectFunctionCall3,
* but that does not work since record_recv wants to cache some data
* using fcinfo->flinfo->fn_extra. So we need to pass it our own
* flinfo parameter.
*/
InitFunctionCallInfoData(info, fcinfo->flinfo, 3, InvalidOid, NULL, NULL);
info.arg[0] = PointerGetDatum(&buf);
info.arg[1] = ObjectIdGetDatum(tupType);
info.arg[2] = Int32GetDatum(-1);
info.argnull[0] = false;
info.argnull[1] = false;
info.argnull[2] = false;
result = record_recv(&info);
break;
}
default:
elog(ERROR, "unexpected type: %d", type);
result = (Datum) 0; /* keep compiler quiet */
}
if (input_buffer->items_count == 0)
{
pfree(input_buffer);
input_buffer = NULL;
}
PG_RETURN_DATUM(result);
}
Datum
dbms_pipe_unpack_message_text(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_VARCHAR);
}
Datum
dbms_pipe_unpack_message_date(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_DATE);
}
Datum
dbms_pipe_unpack_message_timestamp(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_TIMESTAMPTZ);
}
Datum
dbms_pipe_unpack_message_number(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_NUMBER);
}
Datum
dbms_pipe_unpack_message_bytea(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_BYTEA);
}
Datum
dbms_pipe_unpack_message_record(PG_FUNCTION_ARGS)
{
return dbms_pipe_unpack_message(fcinfo, IT_RECORD);
}
#define WATCH_PRE(t, et, c) \
et = GetNowFloat() + (float8)t; c = 0; \
do \
{ \
#define WATCH_POST(t,et,c) \
if (GetNowFloat() >= et) \
PG_RETURN_INT32(RESULT_WAIT); \
if (cycle++ % 100 == 0) \
CHECK_FOR_INTERRUPTS(); \
pg_usleep(10000L); \
} while(true && t != 0);
Datum
dbms_pipe_receive_message(PG_FUNCTION_ARGS)
{
text *pipe_name = NULL;
int timeout = ONE_YEAR;
int cycle = 0;
float8 endtime;
bool found = false;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("pipe name is NULL"),
errdetail("Pipename may not be NULL.")));
else
pipe_name = PG_GETARG_TEXT_P(0);
if (!PG_ARGISNULL(1))
timeout = PG_GETARG_INT32(1);
if (input_buffer != NULL)
{
pfree(input_buffer);
input_buffer = NULL;
}
WATCH_PRE(timeout, endtime, cycle);
if (NULL != (input_buffer = get_from_pipe(pipe_name, &found)))
{
input_buffer->next = message_buffer_get_content(input_buffer);
break;
}
/* found empty message */
if (found)
break;
WATCH_POST(timeout, endtime, cycle);
PG_RETURN_INT32(RESULT_DATA);
}
Datum
dbms_pipe_send_message(PG_FUNCTION_ARGS)
{
text *pipe_name = NULL;
int timeout = ONE_YEAR;
int limit = 0;
bool valid_limit;
int cycle = 0;
float8 endtime;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("pipe name is NULL"),
errdetail("Pipename may not be NULL.")));
else
pipe_name = PG_GETARG_TEXT_P(0);
output_buffer = check_buffer(output_buffer, LOCALMSGSZ);
if (!PG_ARGISNULL(1))
timeout = PG_GETARG_INT32(1);
if (PG_ARGISNULL(2))
valid_limit = false;
else
{
limit = PG_GETARG_INT32(2);
valid_limit = true;
}
if (input_buffer != NULL) /* XXX Strange? */
{
pfree(input_buffer);
input_buffer = NULL;
}
WATCH_PRE(timeout, endtime, cycle);
if (add_to_pipe(pipe_name, output_buffer,
limit, valid_limit))
break;
WATCH_POST(timeout, endtime, cycle);
init_buffer(output_buffer, LOCALMSGSZ);
PG_RETURN_INT32(RESULT_DATA);
}
Datum
dbms_pipe_unique_session_name (PG_FUNCTION_ARGS)
{
StringInfoData strbuf;
text *result;
float8 endtime;
int cycle = 0;
int timeout = 10;
WATCH_PRE(timeout, endtime, cycle);
if (ora_lock_shmem(SHMEMMSGSZ, MAX_PIPES,MAX_EVENTS,MAX_LOCKS,false))
{
initStringInfo(&strbuf);
appendStringInfo(&strbuf,"PG$PIPE$%d$%d",sid, MyProcPid);
result = cstring_to_text_with_len(strbuf.data, strbuf.len);
pfree(strbuf.data);
LWLockRelease(shmem_lock);
PG_RETURN_TEXT_P(result);
}
WATCH_POST(timeout, endtime, cycle);
LOCK_ERROR();
PG_RETURN_NULL();
}
#define DB_PIPES_COLS 6
Datum
dbms_pipe_list_pipes(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc;
TupleTableSlot *slot;
AttInMetadata *attinmeta;
PipesFctx *fctx;
float8 endtime;
int cycle = 0;
int timeout = 10;
if (SRF_IS_FIRSTCALL())
{
int i;
MemoryContext oldcontext;
bool has_lock = false;
WATCH_PRE(timeout, endtime, cycle);
if (ora_lock_shmem(SHMEMMSGSZ, MAX_PIPES, MAX_EVENTS, MAX_LOCKS, false))
{
has_lock = true;
break;
}
WATCH_POST(timeout, endtime, cycle);
if (!has_lock)
LOCK_ERROR();
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
fctx = palloc(sizeof(PipesFctx));
funcctx->user_fctx = fctx;
fctx->pipe_nth = 0;
tupdesc = CreateTemplateTupleDesc(DB_PIPES_COLS , false);
i = 0;
TupleDescInitEntry(tupdesc, ++i, "name", VARCHAROID, -1, 0);
TupleDescInitEntry(tupdesc, ++i, "items", INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, ++i, "size", INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, ++i, "limit", INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, ++i, "private", BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, ++i, "owner", VARCHAROID, -1, 0);
Assert(i == DB_PIPES_COLS);
slot = TupleDescGetSlot(tupdesc);
funcctx->slot = slot;
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
fctx = (PipesFctx *) funcctx->user_fctx;
while (fctx->pipe_nth < MAX_PIPES)
{
if (pipes[fctx->pipe_nth].is_valid)
{
Datum result;
HeapTuple tuple;
char *values[DB_PIPES_COLS];