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include vmm.inc mov eax, Semaphore ; semaphore handle mov ecx, Flags ; flags for servicing interrupts VMMcall Wait_Semaphore |
The Wait_Semaphore service blocks the current virtual machine until the semaphore is signaled using the Signal_Semaphore service.
Semaphore
Specifies a handle identifying the semaphore on which to wait.
Flags
Specifies actions to take when interrupts occur while the virtual machine is blocked waiting for the semaphore. This parameter can be a combination of the following values:
| Value | Meaning |
| Block_Enable_Ints | Service interrupts in the virtual machine even if the virtual machine does not currently have interrupts enabled. This forces interrupts to be enabled. This value is only relevant if either Block_Svc_Ints or Block_Svc_If_Ints_Locked is set. |
| Block_Poll | Do not switch away from the blocked virtual machine unless another virtual machine has higher priority. |
| Block_Svc_If_Ints_Locked | Service interrupts in the virtual machine even if the virtual machine is blocked, and the VMStat_V86IntsLocked flag is set. |
| Block_Svc_Ints | Service interrupts in the virtual machine even if the virtual machine is blocked. |
This service has no return value.
This service blocks if the semaphore's unblock count is zero, and the token count is zero or less. Otherwise, it decrements the token count and returns immediately. If the unblock count is not zero (meaning the Signal_Semaphore service has been called), Wait_Semaphore decrements the unblock count and returns immediately.
Flags