Created
October 18, 2019 23:07
-
-
Save enobufs/1019a5a8cc33201b6b0961a12b961152 to your computer and use it in GitHub Desktop.
Cgo deadlock with C.usleep()
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
/* | |
#include <unistd.h> | |
*/ | |
import "C" | |
import ( | |
"log" | |
"time" | |
) | |
// TaskMgr ... | |
type TaskMgr struct { | |
NumRoutines int | |
Count int | |
Interval time.Duration | |
done []chan struct{} | |
} | |
// Start ... | |
func (t *TaskMgr) Start() error { | |
t.done = make([]chan struct{}, t.NumRoutines) | |
for i := 0; i < t.NumRoutines; i++ { | |
t.done[i] = make(chan struct{}, 1) | |
go func(taskID, count int, interval time.Duration, done chan<- struct{}) { | |
for j := 0; j < count; j++ { | |
//log.Printf("task %d: count %d", taskID, j) | |
time.Sleep(interval) | |
} | |
log.Printf("task %d: complete", taskID) | |
close(done) | |
}(i, t.Count, t.Interval, t.done[i]) | |
} | |
return nil | |
} | |
// IsAllDone ... | |
func (t *TaskMgr) IsAllDone() bool { | |
allDone := true | |
loop: | |
for i := 0; i < t.NumRoutines; i++ { | |
select { | |
case <-t.done[i]: | |
log.Printf("task %d is DONE!", i) | |
default: | |
allDone = false | |
break loop | |
} | |
} | |
return allDone | |
} | |
func main() { | |
t := &TaskMgr{ | |
NumRoutines: 4, | |
Count: 50, | |
Interval: 100 * time.Millisecond, | |
} | |
if err := t.Start(); err != nil { | |
panic(err) | |
} | |
for { | |
if t.IsAllDone() { | |
break | |
} | |
//time.Sleep(50 * time.Microsecond) | |
C.usleep(50) | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Deadlock occurred with the above code on an EC2 t2.micro instance.