From: Glauber Costa <glommer@mothafucka.localdomain>
Date: Mon, 28 Sep 2009 18:27:44 +0000 (-0300)
Subject: do proper cpu_self check
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~10326
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e5bc201df7e060bc4c2912258a77c53f8901356c;p=sdk%2Femulator%2Fqemu.git

do proper cpu_self check

Currently, our check for qemu_cpu_self only checks if there is a cpu
currently in execution (represented by cpu_single_env being set). While
this might be okay for tcg, it is certainly not okay for kvm, since multiple
cpus might be executing.

Instead, I propose we use pthread primitives to test if the caller thread is
the same as env->thread.

For tcg, it will have the same semantics as before, since all CPUStates will
point to the same thread, and we'll only have one in execution at a time.

Signed-off-by: Glauber Costa <glommer@mothafucka.localdomain>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---

diff --git a/vl.c b/vl.c
index 4d9db01..19e11b2 100644
--- a/vl.c
+++ b/vl.c
@@ -3591,9 +3591,14 @@ void qemu_cpu_kick(void *_env)
         qemu_thread_signal(env->thread, SIGUSR1);
 }
 
-int qemu_cpu_self(void *env)
+int qemu_cpu_self(void *_env)
 {
-    return (cpu_single_env != NULL);
+    CPUState *env = _env;
+    QemuThread this;
+ 
+    qemu_thread_self(&this);
+ 
+    return qemu_thread_equal(&this, env->thread);
 }
 
 static void cpu_signal(int sig)