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https://github.com/xen-project/xen.git
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Keir Fraser
ce5c899f22
This makes stubdom use the host's gcc instead of downloading/compiling binutils+gcc. That requires a bunch of changes and even uncovered a few bugs, but saves a lot of time. Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
/*
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* locks for newlib
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*
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* Samuel Thibault <Samuel.Thibault@eu.citrix.net>, July 20008
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*/
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#ifdef HAVE_LIBC
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#include <sys/lock.h>
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#include <sched.h>
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#include <wait.h>
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int ___lock_init(_LOCK_T *lock)
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{
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lock->busy = 0;
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init_waitqueue_head(&lock->wait);
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return 0;
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}
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int ___lock_acquire(_LOCK_T *lock)
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{
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unsigned long flags;
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while(1) {
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wait_event(lock->wait, !lock->busy);
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local_irq_save(flags);
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if (!lock->busy)
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break;
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local_irq_restore(flags);
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}
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lock->busy = 1;
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local_irq_restore(flags);
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return 0;
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}
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int ___lock_try_acquire(_LOCK_T *lock)
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{
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unsigned long flags;
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int ret = -1;
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local_irq_save(flags);
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if (!lock->busy) {
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lock->busy = 1;
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ret = 0;
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}
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local_irq_restore(flags);
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return ret;
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}
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int ___lock_release(_LOCK_T *lock)
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{
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unsigned long flags;
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local_irq_save(flags);
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lock->busy = 0;
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wake_up(&lock->wait);
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local_irq_restore(flags);
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return 0;
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}
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int ___lock_init_recursive(_LOCK_RECURSIVE_T *lock)
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{
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lock->owner = NULL;
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init_waitqueue_head(&lock->wait);
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return 0;
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}
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int ___lock_acquire_recursive(_LOCK_RECURSIVE_T *lock)
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{
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unsigned long flags;
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if (lock->owner != get_current()) {
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while (1) {
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wait_event(lock->wait, lock->owner == NULL);
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local_irq_save(flags);
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if (lock->owner == NULL)
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break;
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local_irq_restore(flags);
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}
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lock->owner = get_current();
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local_irq_restore(flags);
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}
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lock->count++;
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return 0;
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}
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int ___lock_try_acquire_recursive(_LOCK_RECURSIVE_T *lock)
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{
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unsigned long flags;
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int ret = -1;
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local_irq_save(flags);
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if (!lock->owner) {
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ret = 0;
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lock->owner = get_current();
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lock->count++;
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}
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local_irq_restore(flags);
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return ret;
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}
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int ___lock_release_recursive(_LOCK_RECURSIVE_T *lock)
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{
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unsigned long flags;
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BUG_ON(lock->owner != get_current());
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if (--lock->count)
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return 0;
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local_irq_save(flags);
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lock->owner = NULL;
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wake_up(&lock->wait);
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local_irq_restore(flags);
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return 0;
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}
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#endif
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