Opened 17 years ago
Last modified 17 years ago
#27 closed defect
send-recv deadlock — at Initial Version
| Reported by: | Stephen Siegel | Owned by: | zirkel |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | examples | Version: | 1.0 |
| Keywords: | deadlock send recv message-passing diffusion | Cc: |
Description
To do a message-passing data exchange, you need to send first, receive second. Otherwise deadlock will ensue. In diffusion example, the receives happen first (check for this in other examples as well):
{{
void exchange_ghost_cells() {
if(left >= 0) send(v[1], left, 0);
if(right < nprocs){
recv(v[nxl+1], right, 0);
send(v[nxl], right, 0);
}
if(left >= 0) recv(v[0], left, 0);
}
}}
Note:
See TracTickets
for help on using tickets.
