Changeset 3502 in kBuild

Timestamp:

Dec 14, 2021 11:13:33 PM (3 years ago)

Author:

bird

Message:

kash: shthread.h: Did asm implementation of the two atomics so the code compiles with older GCC version that doesn't have the sync_add_and_fetch and sync_sub_and_fetch functionality.

File:

• trunk/src/kash/shthread.h (modified) (3 diffs)

trunk/src/kash/shthread.h

@@ -52 +52 @@
 void shthread_set_shell(struct shinstance *);
 struct shinstance *shthread_get_shell(void);
+void shthread_set_name(const char *name);
 
 int shmtx_init(shmtx *pmtx);
@@ -63 +64 @@
 #ifdef _MSC_VER
     return _InterlockedIncrement((long *)valuep);
+#elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86)
+    unsigned uRet;
+    __asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (1) : "memory", "cc");
+    return uRet + 1;
 #else
     return __sync_add_and_fetch(valuep, 1);
@@ -72 +77 @@
 #ifdef _MSC_VER
     return _InterlockedDecrement((long *)valuep);
+#elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86)
+    unsigned uRet;
+    __asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (-1) : "memory", "cc");
+    return uRet - 1;
 #else
     return __sync_sub_and_fetch(valuep, 1);