MPI_Win_lock_all(3) MPI MPI_Win_lock_all(3) NAME MPI_Win_lock_all - Begin an RMA access epoch at all processes on the given window SYNOPSIS int MPI_Win_lock_all(int assert, MPI_Win win) INPUT PARAMETERS assert - program assertion (integer) win - window object (handle) NOTES This call is not collective. The assert argument is used to indicate special conditions for the fence that an implementation may use to optimize the MPI_Win_lock_all operation. The value zero is always correct. Other assertion values may be or'ed to- gether. Assertions that are valid for MPI_Win_lock_all are: MPI_MODE_NOCHECK - No other process holds, or will attempt to acquire a conflicting lock, while the caller holds the window lock. This is useful when mutual exclusion is achieved by other means, but the coherence oper- ations that may be attached to the lock and unlock calls are still required. There may be additional overheads associated with using MPI_Win_lock and MPI_Win_lock_all concurrently on the same window. These over- heads could be avoided by specifying the assertion MPI_MODE_NOCHECK when possible THREAD AND INTERRUPT SAFETY This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe. NOTES FOR FORTRAN All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr is an inte- ger and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call state- ment. All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran. ERRORS All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in the last ar- gument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error han- dler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible. MPI_SUCCESS - No error; MPI routine completed successfully. MPI_ERR_WIN - Invalid MPI window object MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. SEE ALSO MPI_Win_unlock_all 4/10/2026 MPI_Win_lock_all(3)
NAME | SYNOPSIS | INPUT PARAMETERS | NOTES | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS | SEE ALSO
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=MPI_Win_lock_all&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>