src/share/vm/runtime/os.cpp

rev 4773 : 8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>

*** 263,274 ****
          VMThread::execute(&jni_op);
          VM_FindDeadlocks op1(tty);
          VMThread::execute(&op1);
          Universe::print_heap_at_SIGBREAK();
          if (PrintClassHistogram) {
!           VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */,
!                                    true /* need_prologue */);
            VMThread::execute(&op1);
          }
          if (JvmtiExport::should_post_data_dump()) {
            JvmtiExport::post_data_dump();
          }
--- 263,273 ----
          VMThread::execute(&jni_op);
          VM_FindDeadlocks op1(tty);
          VMThread::execute(&op1);
          Universe::print_heap_at_SIGBREAK();
          if (PrintClassHistogram) {
!           VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */);
            VMThread::execute(&op1);
          }
          if (JvmtiExport::should_post_data_dump()) {
            JvmtiExport::post_data_dump();
          }
*** 1442,1456 ****
    // If we reached EOF, it will be returned on next call.
  
    return (int) i;
  }
  
  bool os::create_stack_guard_pages(char* addr, size_t bytes) {
    return os::pd_create_stack_guard_pages(addr, bytes);
  }
  
- 
  char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
    char* result = pd_reserve_memory(bytes, addr, alignment_hint);
    if (result != NULL) {
      MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC);
    }
--- 1441,1460 ----
    // If we reached EOF, it will be returned on next call.
  
    return (int) i;
  }
  
+ void os::SuspendedThreadTask::run() {
+   assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this");
+   internal_do_task();
+   _done = true;
+ }
+ 
  bool os::create_stack_guard_pages(char* addr, size_t bytes) {
    return os::pd_create_stack_guard_pages(addr, bytes);
  }
  
  char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
    char* result = pd_reserve_memory(bytes, addr, alignment_hint);
    if (result != NULL) {
      MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC);
    }
*** 1549,1553 ****
--- 1553,1573 ----
  
  void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
    pd_realign_memory(addr, bytes, alignment_hint);
  }
  
+ #ifndef TARGET_OS_FAMILY_windows
+ /* try to switch state from state "from" to state "to"
+  * returns the state set after the method is complete
+  */
+ os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from,
+                                                          os::SuspendResume::State to)
+ {
+   os::SuspendResume::State result =
+     (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from);
+   if (result == from) {
+     // success
+     return to;
+   }
+   return result;
+ }
+ #endif