diff options
Diffstat (limited to 'arch/frv/kernel/semaphore.c')
| -rw-r--r-- | arch/frv/kernel/semaphore.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/arch/frv/kernel/semaphore.c b/arch/frv/kernel/semaphore.c deleted file mode 100644 index 7ee3a147b47..00000000000 --- a/arch/frv/kernel/semaphore.c +++ /dev/null | |||
| @@ -1,155 +0,0 @@ | |||
| 1 | /* semaphore.c: FR-V semaphores | ||
| 2 | * | ||
| 3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | ||
| 4 | * Written by David Howells (dhowells@redhat.com) | ||
| 5 | * - Derived from lib/rwsem-spinlock.c | ||
| 6 | * | ||
| 7 | * This program is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU General Public License | ||
| 9 | * as published by the Free Software Foundation; either version | ||
| 10 | * 2 of the License, or (at your option) any later version. | ||
| 11 | */ | ||
| 12 | |||
| 13 | #include <linux/sched.h> | ||
| 14 | #include <linux/module.h> | ||
| 15 | #include <asm/semaphore.h> | ||
| 16 | |||
| 17 | struct sem_waiter { | ||
| 18 | struct list_head list; | ||
| 19 | struct task_struct *task; | ||
| 20 | }; | ||
| 21 | |||
| 22 | #ifdef CONFIG_DEBUG_SEMAPHORE | ||
| 23 | void semtrace(struct semaphore *sem, const char *str) | ||
| 24 | { | ||
| 25 | if (sem->debug) | ||
| 26 | printk("[%d] %s({%d,%d})\n", | ||
| 27 | current->pid, | ||
| 28 | str, | ||
| 29 | sem->counter, | ||
| 30 | list_empty(&sem->wait_list) ? 0 : 1); | ||
| 31 | } | ||
| 32 | #else | ||
| 33 | #define semtrace(SEM,STR) do { } while(0) | ||
| 34 | #endif | ||
| 35 | |||
| 36 | /* | ||
| 37 | * wait for a token to be granted from a semaphore | ||
| 38 | * - entered with lock held and interrupts disabled | ||
| 39 | */ | ||
| 40 | void __down(struct semaphore *sem, unsigned long flags) | ||
| 41 | { | ||
| 42 | struct task_struct *tsk = current; | ||
| 43 | struct sem_waiter waiter; | ||
| 44 | |||
| 45 | semtrace(sem, "Entering __down"); | ||
| 46 | |||
| 47 | /* set up my own style of waitqueue */ | ||
| 48 | waiter.task = tsk; | ||
| 49 | get_task_struct(tsk); | ||
| 50 | |||
| 51 | list_add_tail(&waiter.list, &sem->wait_list); | ||
| 52 | |||
| 53 | /* we don't need to touch the semaphore struct anymore */ | ||
| 54 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 55 | |||
| 56 | /* wait to be given the semaphore */ | ||
| 57 | set_task_state(tsk, TASK_UNINTERRUPTIBLE); | ||
| 58 | |||
| 59 | for (;;) { | ||
| 60 | if (list_empty(&waiter.list)) | ||
| 61 | break; | ||
| 62 | schedule(); | ||
| 63 | set_task_state(tsk, TASK_UNINTERRUPTIBLE); | ||
| 64 | } | ||
| 65 | |||
| 66 | tsk->state = TASK_RUNNING; | ||
| 67 | semtrace(sem, "Leaving __down"); | ||
| 68 | } | ||
| 69 | |||
| 70 | EXPORT_SYMBOL(__down); | ||
| 71 | |||
| 72 | /* | ||
| 73 | * interruptibly wait for a token to be granted from a semaphore | ||
| 74 | * - entered with lock held and interrupts disabled | ||
| 75 | */ | ||
| 76 | int __down_interruptible(struct semaphore *sem, unsigned long flags) | ||
| 77 | { | ||
| 78 | struct task_struct *tsk = current; | ||
| 79 | struct sem_waiter waiter; | ||
| 80 | int ret; | ||
| 81 | |||
| 82 | semtrace(sem,"Entering __down_interruptible"); | ||
| 83 | |||
| 84 | /* set up my own style of waitqueue */ | ||
| 85 | waiter.task = tsk; | ||
| 86 | get_task_struct(tsk); | ||
| 87 | |||
| 88 | list_add_tail(&waiter.list, &sem->wait_list); | ||
| 89 | |||
| 90 | /* we don't need to touch the semaphore struct anymore */ | ||
| 91 | set_task_state(tsk, TASK_INTERRUPTIBLE); | ||
| 92 | |||
| 93 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 94 | |||
| 95 | /* wait to be given the semaphore */ | ||
| 96 | ret = 0; | ||
| 97 | for (;;) { | ||
| 98 | if (list_empty(&waiter.list)) | ||
| 99 | break; | ||
| 100 | if (unlikely(signal_pending(current))) | ||
| 101 | goto interrupted; | ||
| 102 | schedule(); | ||
| 103 | set_task_state(tsk, TASK_INTERRUPTIBLE); | ||
| 104 | } | ||
| 105 | |||
| 106 | out: | ||
| 107 | tsk->state = TASK_RUNNING; | ||
| 108 | semtrace(sem, "Leaving __down_interruptible"); | ||
| 109 | return ret; | ||
| 110 | |||
| 111 | interrupted: | ||
| 112 | spin_lock_irqsave(&sem->wait_lock, flags); | ||
| 113 | |||
| 114 | if (!list_empty(&waiter.list)) { | ||
| 115 | list_del(&waiter.list); | ||
| 116 | ret = -EINTR; | ||
| 117 | } | ||
| 118 | |||
| 119 | spin_unlock_irqrestore(&sem->wait_lock, flags); | ||
| 120 | if (ret == -EINTR) | ||
| 121 | put_task_struct(current); | ||
| 122 | goto out; | ||
| 123 | } | ||
| 124 | |||
| 125 | EXPORT_SYMBOL(__down_interruptible); | ||
| 126 | |||
| 127 | /* | ||
| 128 | * release a single token back to a semaphore | ||
| 129 | * - entered with lock held and interrupts disabled | ||
| 130 | */ | ||
| 131 | void __up(struct semaphore *sem) | ||
| 132 | { | ||
| 133 | struct task_struct *tsk; | ||
| 134 | struct sem_waiter *waiter; | ||
| 135 | |||
| 136 | semtrace(sem,"Entering __up"); | ||
| 137 | |||
| 138 | /* grant the token to the process at the front of the queue */ | ||
| 139 | waiter = list_entry(sem->wait_list.next, struct sem_waiter, list); | ||
| 140 | |||
| 141 | /* We must be careful not to touch 'waiter' after we set ->task = NULL. | ||
| 142 | * It is allocated on the waiter's stack and may become invalid at | ||
| 143 | * any time after that point (due to a wakeup from another source). | ||
| 144 | */ | ||
| 145 | list_del_init(&waiter->list); | ||
| 146 | tsk = waiter->task; | ||
| 147 | mb(); | ||
| 148 | waiter->task = NULL; | ||
| 149 | wake_up_process(tsk); | ||
| 150 | put_task_struct(tsk); | ||
| 151 | |||
| 152 | semtrace(sem,"Leaving __up"); | ||
| 153 | } | ||
| 154 | |||
| 155 | EXPORT_SYMBOL(__up); | ||
