| 1 | #include "pthread_impl.h" |
| 2 | #include "fork_impl.h" |
| 3 | |
| 4 | static volatile int vmlock[2]; |
| 5 | volatile int *const __vmlock_lockptr = vmlock; |
| 6 | |
| 7 | void __vm_wait() |
| 8 | { |
| 9 | int tmp; |
| 10 | while ((tmp=vmlock[0])) |
| 11 | __wait(vmlock, vmlock+1, tmp, 1); |
| 12 | } |
| 13 | |
| 14 | void __vm_lock() |
| 15 | { |
| 16 | a_inc(vmlock); |
| 17 | } |
| 18 | |
| 19 | void __vm_unlock() |
| 20 | { |
| 21 | if (a_fetch_add(vmlock, -1)==1 && vmlock[1]) |
| 22 | __wake(vmlock, -1, 1); |
| 23 | } |