cpu relax

source/coroed/core/relax.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#define CPU_RELAX() __asm__ volatile("pause" ::: "memory") /* NOLINT */
+
+#define SPINLOOP(spins)                 \
+  do {                                  \
+    for (int i = 0; i < (spins); ++i) { \
+      CPU_RELAX();                      \
+    }                                   \
+  } while (false)

source/coroed/core/spinlock.c

@@ -3,14 +3,16 @@
 #include <assert.h>
 #include <stdatomic.h>
 
+#include "relax.h"
+
 void spinlock_init(struct spinlock* lock) {
   assert(atomic_is_lock_free(&lock->is_locked));
   atomic_store(&lock->is_locked, false);
 }
 
 void spinlock_lock(struct spinlock* lock) {
   while (!spinlock_try_lock(lock)) {
-    // CPU not relax
+    CPU_RELAX();
   }
 }
 

source/coroed/sched/schedy.c

@@ -8,9 +8,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
 
 #include "coroed/api/task.h"
+#include "coroed/core/relax.h"
 #include "coroed/core/spinlock.h"
 #include "kthread.h"
 #include "uthread.h"
@@ -155,7 +155,7 @@ struct task* sched_acquire_next() {
     }
     spinlock_unlock(&tasks_lock);
 
-    sleep(1);
+    SPINLOOP(2 * attempt);
   }
 
   return NULL;