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Special case parallel run with one worker

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This commit is contained in:
Kovid Goyal
2025-06-06 16:02:31 +05:30
parent 5e6d4ea4c0
commit dea6e1da42
1 changed files with 10 additions and 1 deletions
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11
tools/utils/misc.go
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@@ -95,6 +95,15 @@ func Run_in_parallel_over_range(num_procs int, f func(int, int) error, start, li
num_procs = runtime.NumCPU() num_procs = runtime.NumCPU()
} }
num_procs = max(1, min(num_procs, num_items)) num_procs = max(1, min(num_procs, num_items))
if num_procs < 2 {
defer func() {
if r := recover(); r != nil {
stacktrace, e := Format_stacktrace_on_panic(r)
err = fmt.Errorf("%s\n\n%w", stacktrace, e)
}
}()
return f(start, limit)
}
chunk_sz := max(1, num_items/num_procs) chunk_sz := max(1, num_items/num_procs)
var wg sync.WaitGroup var wg sync.WaitGroup
echan := make(chan error, num_procs) echan := make(chan error, num_procs)
@@ -133,7 +142,7 @@ func Map[T any, O any](f func(x T) O, s []T) []O {
func Repeat[T any](x T, n int) []T { func Repeat[T any](x T, n int) []T {
ans := make([]T, n) ans := make([]T, n)
for i := 0; i < n; i++ { for i := range n {
ans[i] = x ans[i] = x
} }
return ans return ans