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| ;; m4 many_spawn.wat.in|wat2wasm --enable-threads -o many_spawn.wasm - | ||
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| ifdef(`NUM',,`define(`NUM',100000)') | ||
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| define(`_repeat',`ifelse(eval($1<=$2),1,`$3`'$0(incr($1),$2,`$3')')')dnl | ||
| define(`repeat',`_repeat(1,$1,``$2'')')dnl | ||
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| define(`EXPECTED',`syscmd(echo "(NUM * (NUM + 1) / 2) % 4294967296" | bc)') | ||
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| (module | ||
| (memory (export "memory") (import "env" "memory") 1 1 shared) | ||
| (func $thread_spawn (import "wasi" "thread-spawn") (param i32) (result i32)) | ||
| (func (export "wasi_thread_start") (param $tid i32) (param $user_arg i32) | ||
| local.get $user_arg | ||
| call $notify | ||
| ) | ||
| (func $notify (param $v i32) | ||
| i32.const 4 | ||
| local.get $v | ||
| i32.atomic.rmw.add | ||
| drop | ||
| i32.const 0 | ||
| i32.const 1 | ||
| i32.atomic.rmw.sub | ||
| i32.const 1 | ||
| i32.ne | ||
| br_if 0 | ||
| i32.const 0 | ||
| i32.const 1 | ||
| memory.atomic.notify | ||
| drop | ||
| ) | ||
| (func $spawn (param i32) | ||
| ;; spawn a thread | ||
| local.get 0 | ||
| call $thread_spawn | ||
| ;; check error | ||
| i32.const 0 | ||
| i32.le_s | ||
| if | ||
| unreachable | ||
| end | ||
| ) | ||
| (func $test (export "test") (param $num i32) (result i32) (local $tmp i32) | ||
| i32.const 0 | ||
| local.get $num | ||
| i32.store | ||
| ;; spawn threads | ||
| local.get $num | ||
| loop (param i32) | ||
| local.tee $tmp | ||
| local.get $tmp | ||
| call $spawn | ||
| i32.const 1 | ||
| i32.sub | ||
| local.tee $tmp | ||
| local.get $tmp | ||
| br_if 0 | ||
| drop | ||
| end | ||
| ;; wait for the threads to finish | ||
| block | ||
| loop | ||
| i32.const 0 | ||
| i32.atomic.load | ||
| local.tee $tmp | ||
| i32.eqz | ||
| br_if 1 | ||
| i32.const 0 | ||
| local.get $tmp | ||
| i64.const -1 | ||
| memory.atomic.wait32 | ||
| ;; assert it was not a timeout | ||
| i32.const 2 | ||
| i32.eq | ||
| if | ||
| unreachable | ||
| end | ||
| br 0 | ||
| end | ||
| end | ||
| i32.const 4 | ||
| i32.load | ||
| ) | ||
| (func (export "_start") | ||
| i32.const NUM | ||
| call $test | ||
| i32.const EXPECTED | ||
| i32.eq | ||
| block (param i32) | ||
| br_if 0 | ||
| unreachable | ||
| end | ||
| ) | ||
| ) |