Patchwork [02/11] store thread-specific env information

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Submitter Glauber Costa
Date Dec. 2, 2009, 1:48 p.m.
Message ID <1259761702-4041-3-git-send-email-glommer@redhat.com>
Download mbox | patch
Permalink /patch/40069/
State New
Headers show

Comments

Glauber Costa - Dec. 2, 2009, 1:48 p.m.
Since we'll have multiple cpu threads, at least for kvm, we need a way to store
and retrieve the CPUState associated with the current execution thread.
For the I/O thread, this will be NULL.

I am using pthread functions for that, for portability, but we could as well
use __thread keyword.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 vl.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

Patch

diff --git a/vl.c b/vl.c
index 44763af..321b18d 100644
--- a/vl.c
+++ b/vl.c
@@ -3434,6 +3434,24 @@  static void block_io_signals(void);
 static void unblock_io_signals(void);
 static int tcg_has_work(void);
 
+static pthread_key_t current_env;
+
+CPUState *qemu_get_current_env(void);
+CPUState *qemu_get_current_env(void)
+{
+    return pthread_getspecific(current_env);
+}
+
+static void qemu_set_current_env(CPUState *env)
+{
+    pthread_setspecific(current_env, env);
+}
+
+static void qemu_init_current_env(void)
+{
+    pthread_key_create(&current_env, NULL);
+}
+
 static int qemu_init_main_loop(void)
 {
     int ret;
@@ -3446,6 +3464,7 @@  static int qemu_init_main_loop(void)
     qemu_mutex_init(&qemu_fair_mutex);
     qemu_mutex_init(&qemu_global_mutex);
     qemu_mutex_lock(&qemu_global_mutex);
+    qemu_init_current_env();
 
     unblock_io_signals();
     qemu_thread_self(&io_thread);
@@ -3484,6 +3503,8 @@  static void *kvm_cpu_thread_fn(void *arg)
 
     block_io_signals();
     qemu_thread_self(env->thread);
+    qemu_set_current_env(env);
+
     if (kvm_enabled())
         kvm_init_vcpu(env);