Date: Tue, 05 Jan 2010 14:48:18 +0800 From: David Xu <davidxu@freebsd.org> To: threads@freebsd.org, Daniel Eischen <deischen@freebsd.org> Subject: Underline version of semaphore functions Message-ID: <4B42E0B2.4010507@freebsd.org>
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I saw underline version of semaphore functions in
libc/include/namespace.h:
#define sem_close _sem_close
#define sem_destroy _sem_destroy
#define sem_getvalue _sem_getvalue
#define sem_init _sem_init
#define sem_open _sem_open
#define sem_post _sem_post
#define sem_timedwait _sem_timedwait
#define sem_trywait _sem_trywait
#define sem_unlink _sem_unlink
#define sem_wait _sem_wait
but libc never has them:
pe6300:~> readelf -s /lib/libc.so.7 | grep _sem
35: 000459d4 0 FUNC GLOBAL DEFAULT 10
__sys_semsys@@FBSDprivate_1.0
154: 000457d4 0 FUNC WEAK DEFAULT 10
___semctl@@FBSDprivate_1.0
161: 0003a5e0 81 FUNC GLOBAL DEFAULT 10
__sem_wait@@FBSDprivate_1.0
814: 0003a2e0 232 FUNC GLOBAL DEFAULT 10
__sem_destroy@@FBSDprivate_1.0
850: 000457d4 0 FUNC WEAK DEFAULT 10 __semctl@@FBSD_1.0
903: 0003a0c0 418 FUNC GLOBAL DEFAULT 10
__sem_open@@FBSDprivate_1.0
1005: 00039f00 35 FUNC GLOBAL DEFAULT 10
__sem_unlink@@FBSDprivate_1.0
1173: 000457b4 0 FUNC GLOBAL DEFAULT 10
__sys_semget@@FBSDprivate_1.0
1451: 0003a270 108 FUNC GLOBAL DEFAULT 10
__sem_init@@FBSDprivate_1.0
1520: 00039f80 183 FUNC GLOBAL DEFAULT 10
__sem_close@@FBSDprivate_1.0
1578: 0003a3d0 147 FUNC GLOBAL DEFAULT 10
__sem_getvalue@@FBSDprivate_1.0
1614: 0003a530 164 FUNC GLOBAL DEFAULT 10
__sem_trywait@@FBSDprivate_1.0
2152: 0003a470 81 FUNC GLOBAL DEFAULT 10
__sem_post@@FBSDprivate_1.0
2177: 00045794 0 FUNC GLOBAL DEFAULT 10
__sys_semop@@FBSDprivate_1.0
2323: 00045794 0 FUNC WEAK DEFAULT 10 _semop@@FBSDprivate_1.0
2452: 000457d4 0 FUNC GLOBAL DEFAULT 10
__sys___semctl@@FBSDprivate_1.0
2455: 000457b4 0 FUNC WEAK DEFAULT 10 _semget@@FBSDprivate_1.0
2511: 0003a4d0 88 FUNC GLOBAL DEFAULT 10
__sem_timedwait@@FBSDprivate_1.0
2543: 000459d4 0 FUNC WEAK DEFAULT 10 _semsys@@FBSDprivate_1.0
however libthr provided them:
pe6300:~> readelf -s /lib/libthr.so.3 | grep _sem
46: 000062d0 326 FUNC GLOBAL DEFAULT 10
_sem_timedwait@@FBSDprivate_1.0
148: 00006420 244 FUNC GLOBAL DEFAULT 10
_sem_wait@@FBSDprivate_1.0
192: 00006250 118 FUNC GLOBAL DEFAULT 10
_sem_destroy@@FBSDprivate_1.0
206: 00006060 107 FUNC GLOBAL DEFAULT 10
_sem_getvalue@@FBSDprivate_1.0
252: 000060d0 210 FUNC GLOBAL DEFAULT 10
_sem_init@@FBSDprivate_1.0
303: 000061b0 153 FUNC GLOBAL DEFAULT 10
_sem_post@@FBSDprivate_1.0
354: 00006520 146 FUNC GLOBAL DEFAULT 10
_sem_trywait@@FBSDprivate_1.0
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