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Comparing libeio/eio.c (file contents):
Revision 1.58 by root, Sat Oct 30 14:36:53 2010 UTC vs.
Revision 1.62 by root, Tue Feb 15 03:15:16 2011 UTC

1/* 1/*
2 * libeio implementation 2 * libeio implementation
3 * 3 *
4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libeio@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
… …
79# include <unistd.h> 79# include <unistd.h>
80# include <utime.h> 80# include <utime.h>
81# include <signal.h> 81# include <signal.h>
82# include <dirent.h> 82# include <dirent.h>
83 83
84#if _POSIX_MEMLOCK || _POSIX_MAPPED_FILES 84#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
85# include <sys/mman.h> 85# include <sys/mman.h>
86#endif 86#endif
87 87
88/* POSIX_SOURCE is useless on bsd's, and XOPEN_SOURCE is unreliable there, too */ 88/* POSIX_SOURCE is useless on bsd's, and XOPEN_SOURCE is unreliable there, too */
89# if __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ 89# if __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__
… …
132#endif 132#endif
133#ifndef D_NAMLEN 133#ifndef D_NAMLEN
134# define D_NAMLEN(de) strlen ((de)->d_name) 134# define D_NAMLEN(de) strlen ((de)->d_name)
135#endif 135#endif
136 136
137/* number of seconds after which an idle threads exit */
138#define IDLE_TIMEOUT 10
139
140/* used for struct dirent, AIX doesn't provide it */ 137/* used for struct dirent, AIX doesn't provide it */
141#ifndef NAME_MAX 138#ifndef NAME_MAX
142# define NAME_MAX 4096 139# define NAME_MAX 4096
143#endif 140#endif
144 141
… …
223static unsigned int max_poll_reqs; /* reslock */ 220static unsigned int max_poll_reqs; /* reslock */
224 221
225static volatile unsigned int nreqs; /* reqlock */ 222static volatile unsigned int nreqs; /* reqlock */
226static volatile unsigned int nready; /* reqlock */ 223static volatile unsigned int nready; /* reqlock */
227static volatile unsigned int npending; /* reqlock */ 224static volatile unsigned int npending; /* reqlock */
228static volatile unsigned int max_idle = 4; 225static volatile unsigned int max_idle = 4; /* maximum number of threads that can idle indefinitely */
226static volatile unsigned int idle_timeout = 10; /* number of seconds after which an idle threads exit */
229 227
230static xmutex_t wrklock = X_MUTEX_INIT; 228static xmutex_t wrklock;
231static xmutex_t reslock = X_MUTEX_INIT; 229static xmutex_t reslock;
232static xmutex_t reqlock = X_MUTEX_INIT; 230static xmutex_t reqlock;
233static xcond_t reqwait = X_COND_INIT; 231static xcond_t reqwait;
234 232
235#if !HAVE_PREADWRITE 233#if !HAVE_PREADWRITE
236/* 234/*
237 * make our pread/pwrite emulation safe against themselves, but not against 235 * make our pread/pwrite emulation safe against themselves, but not against
238 * normal read/write by using a mutex. slows down execution a lot, 236 * normal read/write by using a mutex. slows down execution a lot,
… …
368 } 366 }
369 367
370 abort (); 368 abort ();
371} 369}
372 370
371static void etp_thread_init (void)
372{
373 X_MUTEX_CREATE (wrklock);
374 X_MUTEX_CREATE (reslock);
375 X_MUTEX_CREATE (reqlock);
376 X_COND_CREATE (reqwait);
377}
378
373static void etp_atfork_prepare (void) 379static void etp_atfork_prepare (void)
374{ 380{
375 X_LOCK (wrklock); 381 X_LOCK (wrklock);
376 X_LOCK (reqlock); 382 X_LOCK (reqlock);
377 X_LOCK (reslock); 383 X_LOCK (reslock);
… …
415 idle = 0; 421 idle = 0;
416 nreqs = 0; 422 nreqs = 0;
417 nready = 0; 423 nready = 0;
418 npending = 0; 424 npending = 0;
419 425
420 etp_atfork_parent (); 426 etp_thread_init ();
421} 427}
422 428
423static void 429static void
424etp_once_init (void) 430etp_once_init (void)
425{ 431{
432 etp_thread_init ();
426 X_THREAD_ATFORK (etp_atfork_prepare, etp_atfork_parent, etp_atfork_child); 433 X_THREAD_ATFORK (etp_atfork_prepare, etp_atfork_parent, etp_atfork_child);
427} 434}
428 435
429static int 436static int
430etp_init (void (*want_poll)(void), void (*done_poll)(void)) 437etp_init (void (*want_poll)(void), void (*done_poll)(void))
… …
621} 628}
622 629
623static void etp_set_max_idle (unsigned int nthreads) 630static void etp_set_max_idle (unsigned int nthreads)
624{ 631{
625 if (WORDACCESS_UNSAFE) X_LOCK (reqlock); 632 if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
626 max_idle = nthreads <= 0 ? 1 : nthreads; 633 max_idle = nthreads;
634 if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
635}
636
637static void etp_set_idle_timeout (unsigned int seconds)
638{
639 if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
640 idle_timeout = seconds;
627 if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock); 641 if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
628} 642}
629 643
630static void etp_set_min_parallel (unsigned int nthreads) 644static void etp_set_min_parallel (unsigned int nthreads)
631{ 645{
… …
759void eio_set_max_idle (unsigned int nthreads) 773void eio_set_max_idle (unsigned int nthreads)
760{ 774{
761 etp_set_max_idle (nthreads); 775 etp_set_max_idle (nthreads);
762} 776}
763 777
778void eio_set_idle_timeout (unsigned int seconds)
779{
780 etp_set_idle_timeout (seconds);
781}
782
764void eio_set_min_parallel (unsigned int nthreads) 783void eio_set_min_parallel (unsigned int nthreads)
765{ 784{
766 etp_set_min_parallel (nthreads); 785 etp_set_min_parallel (nthreads);
767} 786}
768 787
… …
816 835
817 return res; 836 return res;
818} 837}
819#endif 838#endif
820 839
821#ifndef HAVE_FUTIMES 840#ifndef HAVE_UTIMES
822 841
823# undef utimes 842# undef utimes
824# undef futimes
825# define utimes(path,times) eio__utimes (path, times) 843# define utimes(path,times) eio__utimes (path, times)
826# define futimes(fd,times) eio__futimes (fd, times)
827 844
828static int 845static int
829eio__utimes (const char *filename, const struct timeval times[2]) 846eio__utimes (const char *filename, const struct timeval times[2])
830{ 847{
831 if (times) 848 if (times)
… …
838 return utime (filename, &buf); 855 return utime (filename, &buf);
839 } 856 }
840 else 857 else
841 return utime (filename, 0); 858 return utime (filename, 0);
842} 859}
860
861#endif
862
863#ifndef HAVE_FUTIMES
864
865# undef futimes
866# define futimes(fd,times) eio__futimes (fd, times)
843 867
844static int eio__futimes (int fd, const struct timeval tv[2]) 868static int eio__futimes (int fd, const struct timeval tv[2])
845{ 869{
846 errno = ENOSYS; 870 errno = ENOSYS;
847 return -1; 871 return -1;
… …
1426 /* round up length */ 1450 /* round up length */
1427 *length = (*length + mask) & ~mask; 1451 *length = (*length + mask) & ~mask;
1428} 1452}
1429 1453
1430#if !_POSIX_MEMLOCK 1454#if !_POSIX_MEMLOCK
1431# define eio__mlock(a,b) ((errno = ENOSYS), -1)
1432# define eio__mlockall(a) ((errno = ENOSYS), -1) 1455# define eio__mlockall(a) ((errno = ENOSYS), -1)
1433#else 1456#else
1434
1435static int
1436eio__mlock (void *addr, size_t length)
1437{
1438 eio_page_align (&addr, &length);
1439
1440 return mlock (addr, length);
1441}
1442 1457
1443static int 1458static int
1444eio__mlockall (int flags) 1459eio__mlockall (int flags)
1445{ 1460{
1446 #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 7 1461 #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 7
… …
1456 | (flags & EIO_MCL_FUTURE ? MCL_FUTURE : 0); 1471 | (flags & EIO_MCL_FUTURE ? MCL_FUTURE : 0);
1457 } 1472 }
1458 1473
1459 return mlockall (flags); 1474 return mlockall (flags);
1460} 1475}
1476#endif
1477
1478#if !_POSIX_MEMLOCK_RANGE
1479# define eio__mlock(a,b) ((errno = ENOSYS), -1)
1480#else
1481
1482static int
1483eio__mlock (void *addr, size_t length)
1484{
1485 eio_page_align (&addr, &length);
1486
1487 return mlock (addr, length);
1488}
1489
1461#endif 1490#endif
1462 1491
1463#if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO) 1492#if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO)
1464# define eio__msync(a,b,c) ((errno = ENOSYS), -1) 1493# define eio__msync(a,b,c) ((errno = ENOSYS), -1)
1465#else 1494#else
… …
1541 if (req) 1570 if (req)
1542 break; 1571 break;
1543 1572
1544 ++idle; 1573 ++idle;
1545 1574
1546 ts.tv_sec = time (0) + IDLE_TIMEOUT; 1575 ts.tv_sec = time (0) + idle_timeout;
1547 if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT) 1576 if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT)
1548 { 1577 {
1549 if (idle > max_idle) 1578 if (idle > max_idle)
1550 { 1579 {
1551 --idle; 1580 --idle;
… …
1671 case EIO_RMDIR: req->result = rmdir (req->ptr1); break; 1700 case EIO_RMDIR: req->result = rmdir (req->ptr1); break;
1672 case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break; 1701 case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break;
1673 case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break; 1702 case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break;
1674 case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break; 1703 case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break;
1675 case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break; 1704 case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break;
1676 case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->int3); break; 1705 case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->offs); break;
1677 1706
1678 case EIO_READLINK: ALLOC (PATH_MAX); 1707 case EIO_READLINK: ALLOC (PATH_MAX);
1679 req->result = readlink (req->ptr1, req->ptr2, PATH_MAX); break; 1708 req->result = readlink (req->ptr1, req->ptr2, PATH_MAX); break;
1680 1709
1681 case EIO_SYNC: req->result = 0; sync (); break; 1710 case EIO_SYNC: req->result = 0; sync (); break;
… …
1931 REQ (EIO_READDIR); PATH; req->int1 = flags; SEND; 1960 REQ (EIO_READDIR); PATH; req->int1 = flags; SEND;
1932} 1961}
1933 1962
1934eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data) 1963eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data)
1935{ 1964{
1936 REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->int3 = (long)dev; SEND; 1965 REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->offs = (off_t)dev; SEND;
1937} 1966}
1938 1967
1939static eio_req * 1968static eio_req *
1940eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data) 1969eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data)
1941{ 1970{

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