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Run prefilter/postfilter shells via single-threaded worker processes #389

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Run prefilter/postfilter shells via single-threaded worker processes #389

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9 changes: 9 additions & 0 deletions main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@
#include "attribute.hpp"
#include "thread.hpp"
#include "platform.hpp"
#include "plugin.hpp"

static int low_detail = 12;
static int full_detail = -1;
Expand Down Expand Up @@ -3714,6 +3715,14 @@ int main(int argc, char **argv) {

signal(SIGPIPE, SIG_IGN);

// Pre-fork the filter worker pool while we are still single-threaded.
// Spawning them now (before any reader or tiling threads) means each
// worker is a clean, single-threaded process, so its later fork()s
// for the prefilter/postfilter shells are cheap and safe.
if (prefilter != NULL || postfilter != NULL) {
filter_workers_init(CPUS);
}

files_open_at_start = open(get_null_device(), O_RDONLY | O_CLOEXEC);
if (files_open_at_start < 0) {
perror("open /dev/null");
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