Header And Logo
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#include "postgres_fe.h"#include "pg_upgrade.h"#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/wait.h>
Go to the source code of this file.
Functions | |
| void | parallel_exec_prog (const char *log_file, const char *opt_log_file, const char *fmt,...) |
| void | parallel_transfer_all_new_dbs (DbInfoArr *old_db_arr, DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata, char *old_tablespace) |
| bool | reap_child (bool wait_for_child) |
Variables | |
| static int | parallel_jobs |
| void parallel_exec_prog | ( | const char * | log_file, | |
| const char * | opt_log_file, | |||
| const char * | fmt, | |||
| ... | ||||
| ) |
Definition at line 65 of file parallel.c.
References exec_prog(), i, UserOpts::jobs, NULL, parallel_jobs, PG_FATAL, pg_log(), pg_malloc(), reap_child(), strerror(), user_opts, and vsnprintf().
Referenced by create_new_objects(), and generate_old_dump().
{
va_list args;
char cmd[MAX_STRING];
#ifndef WIN32
pid_t child;
#else
HANDLE child;
exec_thread_arg *new_arg;
#endif
va_start(args, fmt);
vsnprintf(cmd, sizeof(cmd), fmt, args);
va_end(args);
if (user_opts.jobs <= 1)
/* throw_error must be true to allow jobs */
exec_prog(log_file, opt_log_file, true, "%s", cmd);
else
{
/* parallel */
#ifdef WIN32
cur_thread_args = (void **)exec_thread_args;
#endif
/* harvest any dead children */
while (reap_child(false) == true)
;
/* must we wait for a dead child? */
if (parallel_jobs >= user_opts.jobs)
reap_child(true);
/* set this before we start the job */
parallel_jobs++;
/* Ensure stdio state is quiesced before forking */
fflush(NULL);
#ifndef WIN32
child = fork();
if (child == 0)
/* use _exit to skip atexit() functions */
_exit(!exec_prog(log_file, opt_log_file, true, "%s", cmd));
else if (child < 0)
/* fork failed */
pg_log(PG_FATAL, "could not create worker process: %s\n", strerror(errno));
#else
if (thread_handles == NULL)
{
int i;
thread_handles = pg_malloc(user_opts.jobs * sizeof(HANDLE));
exec_thread_args = pg_malloc(user_opts.jobs * sizeof(exec_thread_arg *));
/*
* For safety and performance, we keep the args allocated during
* the entire life of the process, and we don't free the args
* in a thread different from the one that allocated it.
*/
for (i = 0; i < user_opts.jobs; i++)
exec_thread_args[i] = pg_malloc(sizeof(exec_thread_arg));
}
/* use first empty array element */
new_arg = exec_thread_args[parallel_jobs-1];
/* Can only pass one pointer into the function, so use a struct */
strcpy(new_arg->log_file, log_file);
strcpy(new_arg->opt_log_file, opt_log_file);
strcpy(new_arg->cmd, cmd);
child = (HANDLE) _beginthreadex(NULL, 0, (void *) win32_exec_prog,
new_arg, 0, NULL);
if (child == 0)
pg_log(PG_FATAL, "could not create worker thread: %s\n", strerror(errno));
thread_handles[parallel_jobs-1] = child;
#endif
}
return;
}
| void parallel_transfer_all_new_dbs | ( | DbInfoArr * | old_db_arr, | |
| DbInfoArr * | new_db_arr, | |||
| char * | old_pgdata, | |||
| char * | new_pgdata, | |||
| char * | old_tablespace | |||
| ) |
Definition at line 170 of file parallel.c.
References i, UserOpts::jobs, NULL, parallel_jobs, PG_FATAL, pg_log(), pg_malloc(), reap_child(), strerror(), transfer_all_new_dbs(), and user_opts.
Referenced by transfer_all_new_tablespaces().
{
#ifndef WIN32
pid_t child;
#else
HANDLE child;
transfer_thread_arg *new_arg;
#endif
if (user_opts.jobs <= 1)
/* throw_error must be true to allow jobs */
transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata, new_pgdata, NULL);
else
{
/* parallel */
#ifdef WIN32
cur_thread_args = (void **)transfer_thread_args;
#endif
/* harvest any dead children */
while (reap_child(false) == true)
;
/* must we wait for a dead child? */
if (parallel_jobs >= user_opts.jobs)
reap_child(true);
/* set this before we start the job */
parallel_jobs++;
/* Ensure stdio state is quiesced before forking */
fflush(NULL);
#ifndef WIN32
child = fork();
if (child == 0)
{
transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata, new_pgdata,
old_tablespace);
/* if we take another exit path, it will be non-zero */
/* use _exit to skip atexit() functions */
_exit(0);
}
else if (child < 0)
/* fork failed */
pg_log(PG_FATAL, "could not create worker process: %s\n", strerror(errno));
#else
if (thread_handles == NULL)
{
int i;
thread_handles = pg_malloc(user_opts.jobs * sizeof(HANDLE));
transfer_thread_args = pg_malloc(user_opts.jobs * sizeof(transfer_thread_arg *));
/*
* For safety and performance, we keep the args allocated during
* the entire life of the process, and we don't free the args
* in a thread different from the one that allocated it.
*/
for (i = 0; i < user_opts.jobs; i++)
transfer_thread_args[i] = pg_malloc(sizeof(transfer_thread_arg));
}
/* use first empty array element */
new_arg = transfer_thread_args[parallel_jobs-1];
/* Can only pass one pointer into the function, so use a struct */
new_arg->old_db_arr = old_db_arr;
new_arg->new_db_arr = new_db_arr;
strcpy(new_arg->old_pgdata, old_pgdata);
strcpy(new_arg->new_pgdata, new_pgdata);
strcpy(new_arg->old_tablespace, old_tablespace);
child = (HANDLE) _beginthreadex(NULL, 0, (void *) win32_exec_prog,
new_arg, 0, NULL);
if (child == 0)
pg_log(PG_FATAL, "could not create worker thread: %s\n", strerror(errno));
thread_handles[parallel_jobs-1] = child;
#endif
}
return;
}
Definition at line 274 of file parallel.c.
References UserOpts::jobs, parallel_jobs, PG_FATAL, pg_log(), strerror(), user_opts, WEXITSTATUS, and WIFEXITED.
Referenced by create_new_objects(), generate_old_dump(), parallel_exec_prog(), parallel_transfer_all_new_dbs(), and transfer_all_new_tablespaces().
{
#ifndef WIN32
int work_status;
int ret;
#else
int thread_num;
DWORD res;
#endif
if (user_opts.jobs <= 1 || parallel_jobs == 0)
return false;
#ifndef WIN32
ret = waitpid(-1, &work_status, wait_for_child ? 0 : WNOHANG);
/* no children or, for WNOHANG, no dead children */
if (ret <= 0 || !WIFEXITED(work_status))
return false;
if (WEXITSTATUS(work_status) != 0)
pg_log(PG_FATAL, "child worker exited abnormally: %s\n", strerror(errno));
#else
/* wait for one to finish */
thread_num = WaitForMultipleObjects(parallel_jobs, thread_handles,
false, wait_for_child ? INFINITE : 0);
if (thread_num == WAIT_TIMEOUT || thread_num == WAIT_FAILED)
return false;
/* compute thread index in active_threads */
thread_num -= WAIT_OBJECT_0;
/* get the result */
GetExitCodeThread(thread_handles[thread_num], &res);
if (res != 0)
pg_log(PG_FATAL, "child worker exited abnormally: %s\n", strerror(errno));
/* dispose of handle to stop leaks */
CloseHandle(thread_handles[thread_num]);
/* Move last slot into dead child's position */
if (thread_num != parallel_jobs - 1)
{
void *tmp_args;
thread_handles[thread_num] = thread_handles[parallel_jobs - 1];
/*
* We must swap the arg struct pointers because the thread we
* just moved is active, and we must make sure it is not
* reused by the next created thread. Instead, the new thread
* will use the arg struct of the thread that just died.
*/
tmp_args = cur_thread_args[thread_num];
cur_thread_args[thread_num] = cur_thread_args[parallel_jobs - 1];
cur_thread_args[parallel_jobs - 1] = tmp_args;
}
#endif
/* do this after job has been removed */
parallel_jobs--;
return true;
}
int parallel_jobs [static] |
Definition at line 23 of file parallel.c.
Referenced by parallel_exec_prog(), parallel_transfer_all_new_dbs(), and reap_child().
1.7.1