75 lines
1.4 KiB
V
75 lines
1.4 KiB
V
import sync
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import time
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fn do_rec_i64(ch chan i64) {
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mut sum := i64(0)
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for _ in 0 .. 300 {
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sum += <-ch
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}
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assert sum == 300 * (300 - 1) / 2
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}
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fn do_send_int(ch chan int) {
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for i in 0 .. 300 {
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ch <- i
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}
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}
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fn do_send_byte(ch chan byte) {
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for i in 0 .. 300 {
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ch <- byte(i)
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}
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}
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fn do_send_i64(ch chan i64) {
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for i in 0 .. 300 {
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ch <- i
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}
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}
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fn test_select() {
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chi := chan int{}
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chl := chan i64{cap: 1}
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chb := chan byte{cap: 10}
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recch := chan i64{cap: 0}
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go do_rec_i64(recch)
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go do_send_int(chi)
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go do_send_byte(chb)
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go do_send_i64(chl)
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mut channels := [&sync.Channel(chi), &sync.Channel(recch), &sync.Channel(chl), &sync.Channel(chb)]
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directions := [sync.Direction.pop, .push, .pop, .pop]
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mut sum := i64(0)
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mut rl := i64(0)
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mut ri := int(0)
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mut rb := byte(0)
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mut sl := i64(0)
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mut objs := [voidptr(&ri), &sl, &rl, &rb]
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for _ in 0 .. 1200 {
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idx := sync.channel_select(mut channels, directions, mut objs, -1)
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match idx {
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0 {
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sum += ri
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}
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1 {
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sl++
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}
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2 {
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sum += rl
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}
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3 {
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sum += rb
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}
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else {
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println('got $idx (timeout)')
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}
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}
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}
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// Use Gauß' formula for the first 2 contributions
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expected_sum := 2 * (300 * (300 - 1) / 2) +
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// the 3rd contribution is `byte` and must be seen modulo 256
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256 * (256 - 1) / 2 +
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44 * (44 - 1) / 2
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assert sum == expected_sum
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time.sleep_ms(20) // to give assert in coroutine enough time
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}
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