tcg: introduce tcg_current_cpu

This is already useful on Windows in order to remove tls.h, because
accesses to current_cpu are done from a different thread on that
platform.  It will be used on POSIX platforms as soon TCG stops using
signals to interrupt the execution of translated code.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/cpus.c b/cpus.c
index e831aa398f..6cebb7aa92 100644
--- a/cpus.c
+++ b/cpus.c
@@ -663,8 +663,9 @@ static void cpu_handle_guest_debug(CPUState *cpu)
 
 static void cpu_signal(int sig)
 {
-    if (current_cpu) {
-        cpu_exit(current_cpu);
+    CPUState *cpu = atomic_mb_read(&tcg_current_cpu);
+    if (cpu) {
+        cpu_exit(cpu);
     }
     exit_request = 1;
 }