From 5798978f77ef8c3efb3c99fa7fb9538c5c597024 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Thu, 27 Feb 2025 11:54:49 -0500
Subject: bfstd: New nproc() function

---
 src/bfstd.c | 10 ++++++++++
 src/bfstd.h |  5 +++++
 src/ctx.c   | 21 ++++++---------------
 3 files changed, 21 insertions(+), 15 deletions(-)

(limited to 'src')

diff --git a/src/bfstd.c b/src/bfstd.c
index 219b8d0..aee6930 100644
--- a/src/bfstd.c
+++ b/src/bfstd.c
@@ -775,6 +775,16 @@ long xsysconf(int name) {
 	return ret;
 }
 
+long nproc(void) {
+	long nproc = xsysconf(_SC_NPROCESSORS_ONLN);
+
+	if (nproc < 1) {
+		return 1;
+	} else {
+		return nproc;
+	}
+}
+
 size_t asciilen(const char *str) {
 	return asciinlen(str, strlen(str));
 }
diff --git a/src/bfstd.h b/src/bfstd.h
index 84f92ec..28f473e 100644
--- a/src/bfstd.h
+++ b/src/bfstd.h
@@ -463,6 +463,11 @@ long xsysconf(int name);
 #define sysoption(name) \
 	(_POSIX_##name == 0 ? xsysconf(_SC_##name) : _POSIX_##name)
 
+/**
+ * Get the number of CPU threads available to the current process.
+ */
+long nproc(void);
+
 #include <wchar.h>
 
 /**
diff --git a/src/ctx.c b/src/ctx.c
index 2c55a35..d92d8ba 100644
--- a/src/ctx.c
+++ b/src/ctx.c
@@ -24,20 +24,6 @@
 #include <time.h>
 #include <unistd.h>
 
-/** Get the initial value for ctx->threads (-j). */
-static int bfs_nproc(void) {
-	long nproc = xsysconf(_SC_NPROCESSORS_ONLN);
-
-	if (nproc < 1) {
-		nproc = 1;
-	} else if (nproc > 8) {
-		// Not much speedup after 8 threads
-		nproc = 8;
-	}
-
-	return nproc;
-}
-
 struct bfs_ctx *bfs_ctx_new(void) {
 	struct bfs_ctx *ctx = ZALLOC(struct bfs_ctx);
 	if (!ctx) {
@@ -50,9 +36,14 @@ struct bfs_ctx *bfs_ctx_new(void) {
 	ctx->maxdepth = INT_MAX;
 	ctx->flags = BFTW_RECOVER;
 	ctx->strategy = BFTW_BFS;
-	ctx->threads = bfs_nproc();
 	ctx->optlevel = 3;
 
+	ctx->threads = nproc();
+	if (ctx->threads > 8) {
+		// Not much speedup after 8 threads
+		ctx->threads = 8;
+	}
+
 	trie_init(&ctx->files);
 
 	ctx->umask = umask(0);
-- 
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