advent2025

commit 8665aa1f238c77ed5b0257987f5ab17de80a81a0
parent ce9a85fe725d5b64306da9cf9e08336c3f3cd347
Author: bsandro <email@bsandro.tech>
Date:   Mon,  1 Dec 2025 19:22:09 +0200

cputime is monotonic now

Diffstat:
M
cputime.h
 | 
6
+++---

1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/cputime.h b/cputime.h
@@ -3,12 +3,12 @@ static volatile unsigned long long now = 0;
 
 void __attribute((constructor)) begin() {
     struct timespec ts;
-    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
     now = ts.tv_sec + ts.tv_nsec;
 }
 
 void __attribute((destructor)) end() {
     struct timespec ts;
-    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
-    printf("%lluμs\n", ((ts.tv_sec+ts.tv_nsec)-now)/1000);
+    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+    printf("%llu μs\n", ((ts.tv_sec+ts.tv_nsec)-now)/1000);
 }