add proc_state.threads metric

bindings/java/src/jni/generate.pl

@@ -348,6 +348,11 @@ my %classes = (
          desc => 'Kernel scheduling priority of process',
          plat => 'DFHLSW'
       },
+      {
+         name => 'threads', type => 'Long',
+         desc => 'Number of active threads',
+         plat => ''
+      },
     ],
     ProcFd => [
       {

bindings/java/src/net/hyperic/sigar/test/TestProcState.java

@@ -21,7 +21,8 @@ public class TestProcState extends SigarTestCase {
         ProcState procState = sigar.getProcState(sigar.getPid());
         char state = procState.getState();
         traceln(procState.getName() + "=" + state);
-        
+        traceln("threads=" + procState.getThreads());
+
         assertTrue((state == 'R') || (state == 'S'));
 
         assertTrue(procState.getName().indexOf("java") != -1);

include/sigar.h

@@ -255,6 +255,7 @@ typedef struct {
     int tty;
     int priority;
     int nice;
+    int threads;
 } sigar_proc_state_t;
 
 SIGAR_DECLARE(int) sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,

src/os/linux/linux_sigar.c

@@ -696,6 +696,29 @@ int sigar_proc_time_get(sigar_t *sigar, sigar_pid_t pid,
     return SIGAR_OK;
 }
 
+static int proc_status_get(sigar_t *sigar, sigar_pid_t pid,
+                           sigar_proc_state_t *procstate)
+{
+    char buffer[BUFSIZ], *ptr;
+    int status = SIGAR_PROC_FILE2STR(buffer, pid, PROC_PSTATUS);
+
+    if (status != SIGAR_OK) {
+        return status;
+    }
+
+    ptr = strstr(buffer, "\nThreads:");
+    if (ptr) {
+        /* 2.6+ kernel only */
+        ptr = sigar_skip_token(ptr);
+        procstate->threads = sigar_strtoul(ptr);
+    }
+    else {
+        procstate->threads = SIGAR_FIELD_NOTIMPL;
+    }
+
+    return SIGAR_OK;
+}
+
 int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
                          sigar_proc_state_t *procstate)
 {
@@ -714,6 +737,8 @@ int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
     procstate->priority = pstat->priority;
     procstate->nice     = pstat->nice;
 
+    proc_status_get(sigar, pid, procstate);
+
     return SIGAR_OK;
 }
 

src/os/solaris/solaris_sigar.c

@@ -660,6 +660,7 @@ int sigar_proc_state_get(sigar_t *sigar, sigar_pid_t pid,
     procstate->tty  = pinfo->pr_ttydev;
     procstate->priority = pinfo->pr_lwp.pr_pri;
     procstate->nice     = pinfo->pr_lwp.pr_nice - NZERO;
+    procstate->threads  = pinfo->pr_nlwp;
 
     switch (pinfo->pr_lwp.pr_state) {
       case SONPROC: