[libvirt] [RFC PATCH v2 11/12] qemu_monitor_json: sort JSON array of cpu info

[Zhu Guihua]

JSON array of cpu info is sorted in order to find thread id of cpu smoothly.

Signed-off-by: Zhu Guihua <zhugh.fnst at cn.fujitsu.com>
---
 src/qemu/qemu_monitor_json.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index da5c14d..96a964c 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1162,6 +1162,21 @@ int qemuMonitorJSONSystemReset(qemuMonitorPtr mon)
     return ret;
 }
 
+static int
+qemuCPUInfoCompare(const void *a,
+                   const void *b)
+{
+    virJSONValuePtr *entrya = (virJSONValuePtr *)a;
+    virJSONValuePtr *entryb = (virJSONValuePtr *)b;
+    int ia;
+    int ib;
+
+    virJSONValueObjectGetNumberInt(*entrya, "CPU", &ia);
+    virJSONValueObjectGetNumberInt(*entryb, "CPU", &ib);
+
+    return ia - ib;
+}
+
 
 /*
  * [ { "CPU": 0, "current": true, "halted": false, "pc": 3227107138 },
@@ -1176,6 +1191,7 @@ qemuMonitorJSONExtractCPUInfo(virJSONValuePtr reply,
     size_t i;
     int *threads = NULL;
     int ncpus;
+    virJSONValuePtr *entryarray = NULL;
 
     if (!(data = virJSONValueObjectGet(reply, "return"))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -1198,16 +1214,26 @@ qemuMonitorJSONExtractCPUInfo(virJSONValuePtr reply,
     if (VIR_ALLOC_N(threads, ncpus) < 0)
         goto cleanup;
 
+    if (VIR_ALLOC_N(entryarray, ncpus) < 0)
+        goto cleanup;
+
     for (i = 0; i < ncpus; i++) {
         virJSONValuePtr entry = virJSONValueArrayGet(data, i);
-        int thread;
         if (!entry) {
             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                            _("cpu information was missing an array element"));
             goto cleanup;
         }
 
-        if (virJSONValueObjectGetNumberInt(entry, "thread_id", &thread) < 0) {
+        entryarray[i] = entry;
+    }
+
+    qsort(entryarray, ncpus, sizeof(entryarray[0]), qemuCPUInfoCompare);
+
+    for (i = 0; i < ncpus; i++) {
+        int thread;
+        if (virJSONValueObjectGetNumberInt(entryarray[i], "thread_id", &thread) < 0) {
+
             /* Some older qemu versions don't report the thread_id,
              * so treat this as non-fatal, simply returning no data */
             ret = 0;
@@ -1223,6 +1249,7 @@ qemuMonitorJSONExtractCPUInfo(virJSONValuePtr reply,
 
  cleanup:
     VIR_FREE(threads);
+    VIR_FREE(entryarray);
     return ret;
 }
 
-- 
1.9.3