HCoop / hcoop / debian / openafs.git / blame
| Commit | Line | Data |
|---|---|---|
| 805e021f CE |
1 | /* |
| 2 | * Copyright 2000, International Business Machines Corporation and others. | |
| 3 | * All Rights Reserved. | |
| 4 | * | |
| 5 | * This software has been released under the terms of the IBM Public | |
| 6 | * License. For details, see the LICENSE file in the top-level source | |
| 7 | * directory or online at http://www.openafs.org/dl/license10.html | |
| 8 | */ | |
| 9 | ||
| 10 | #include <afsconfig.h> | |
| 11 | #include <afs/param.h> | |
| 12 | ||
| 13 | #include <roken.h> | |
| 14 | ||
| 15 | #if defined(AFS_NT40_ENV) && defined(AFS_PTHREAD_ENV) | |
| 16 | #define AFS_GRMUTEX_DECLSPEC __declspec(dllexport) | |
| 17 | #endif | |
| 18 | #ifdef AFS_PTHREAD_ENV | |
| 19 | #include <afs/pthread_glock.h> | |
| 20 | ||
| 21 | /* | |
| 22 | * Implement a pthread based recursive global lock for use in porting | |
| 23 | * old lwp style code to pthreads. | |
| 24 | */ | |
| 25 | ||
| 26 | pthread_recursive_mutex_t grmutex; | |
| 27 | ||
| 28 | static int glock_init = 0; | |
| 29 | static pthread_once_t glock_init_once = PTHREAD_ONCE_INIT; | |
| 30 | ||
| 31 | static void | |
| 32 | glock_init_func(void) | |
| 33 | { | |
| 34 | pthread_mutex_init(&grmutex.mut, (const pthread_mutexattr_t *)0); | |
| 35 | grmutex.times_inside = 0; | |
| 36 | grmutex.owner = (pthread_t) 0; | |
| 37 | grmutex.locked = 0; | |
| 38 | glock_init = 1; | |
| 39 | } | |
| 40 | ||
| 41 | int | |
| 42 | pthread_recursive_mutex_lock(pthread_recursive_mutex_t * mut) | |
| 43 | { | |
| 44 | int rc = 0; | |
| 45 | ||
| 46 | if (!glock_init) | |
| 47 | pthread_once(&glock_init_once, glock_init_func); | |
| 48 | ||
| 49 | if (mut->locked) { | |
| 50 | if (pthread_equal(mut->owner, pthread_self())) { | |
| 51 | mut->times_inside++; | |
| 52 | return rc; | |
| 53 | } | |
| 54 | } | |
| 55 | rc = pthread_mutex_lock(&mut->mut); | |
| 56 | if (rc == 0) { | |
| 57 | mut->times_inside = 1; | |
| 58 | mut->owner = pthread_self(); | |
| 59 | mut->locked = 1; | |
| 60 | } | |
| 61 | ||
| 62 | return rc; | |
| 63 | } | |
| 64 | ||
| 65 | int | |
| 66 | pthread_recursive_mutex_unlock(pthread_recursive_mutex_t * mut) | |
| 67 | { | |
| 68 | int rc = 0; | |
| 69 | ||
| 70 | if (!glock_init) | |
| 71 | pthread_once(&glock_init_once, glock_init_func); | |
| 72 | ||
| 73 | if ((mut->locked) && (pthread_equal(mut->owner, pthread_self()))) { | |
| 74 | mut->times_inside--; | |
| 75 | if (mut->times_inside == 0) { | |
| 76 | mut->locked = 0; | |
| 77 | rc = pthread_mutex_unlock(&mut->mut); | |
| 78 | } | |
| 79 | } else { | |
| 80 | /* | |
| 81 | * Note that you might want to try to differentiate between | |
| 82 | * the two possible reasons you're here, but since we don't | |
| 83 | * hold the mutex, it's useless to try. | |
| 84 | */ | |
| 85 | rc = -1; | |
| 86 | } | |
| 87 | return rc; | |
| 88 | } | |
| 89 | #endif |