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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