[PATCH v4 08/13] accel/tcg: Extract rr_create_vcpu_thread_precheck()

[Philippe Mathieu-Daudé <philippe.mathieu.daude@xxxxxxxxx>]

From: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>

We are going to extract common pattern from rr_start_vcpu_thread().
First extract the rr_create_vcpu_thread_precheck() helper.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
---
 accel/tcg/tcg-accel-ops-rr.c | 7 +++++++
 accel/tcg/tcg-accel-ops-rr.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index de8af32af7..3da684b8e6 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -272,6 +272,13 @@ static void *rr_cpu_thread_fn(void *arg)
     return NULL;
 }
 
+static QemuThread *single_tcg_cpu_thread;
+
+bool rr_create_vcpu_thread_precheck(CPUState *cpu)
+{
+    return !single_tcg_cpu_thread;
+}
+
 void rr_start_vcpu_thread(CPUState *cpu)
 {
     char thread_name[VCPU_THREAD_NAME_SIZE];
diff --git a/accel/tcg/tcg-accel-ops-rr.h b/accel/tcg/tcg-accel-ops-rr.h
index 54f6ae6e86..e2273b66d4 100644
--- a/accel/tcg/tcg-accel-ops-rr.h
+++ b/accel/tcg/tcg-accel-ops-rr.h
@@ -15,6 +15,7 @@
 /* Kick all RR vCPUs. */
 void rr_kick_vcpu_thread(CPUState *unused);
 
+bool rr_create_vcpu_thread_precheck(CPUState *cpu);
 /* start the round robin vcpu thread */
 void rr_start_vcpu_thread(CPUState *cpu);
 
-- 
2.35.1