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Mojo function

shmem_signal_wait_until

shmem_signal_wait_until(sig_addr: UnsafePointer[UInt64], cmp: Int32, cmp_value: UInt64)

Wait for a variable on the local PE to change from a signaling operation.

shmem_signal_wait_until operation blocks until the value contained in the signal data object, sig_addr, at the calling PE satisfies the wait condition. In a program with single-threaded or multithreaded PEs, the sig_addr object at the calling PE is expected only to be updated as a signal. This routine can be used to implement point-to-point synchronization between PEs or between threads within the same PE. A call to this routine blocks until the value of sig_addr at the calling PE satisfies the wait condition specified by the comparison operator, cmp, and comparison value, cmp_value. Implementations must ensure that shmem_signal_wait_until do not return before the update of the memory indicated by sig_addr is fully complete.

Args:

sig_addr (UnsafePointer[UInt64]): Local address of the remotely accessible source signal variable.
cmp (Int32): The comparison operator that compares sig_addr with cmp_value.
cmp_value (UInt64): The value against which the object pointed to by sig_addr will be compared.