5859 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5860 // libraries and should thus be removed. We will leave it behind for a while
5861 // until we no longer want to able to run on top of 1.3.0 Solaris production
5862 // JDK. See 4341971.
5863
5864 #define STACK_SLACK 0x800
5865
5866 extern "C" {
5867 intptr_t sysThreadAvailableStackWithSlack() {
5868 stack_t st;
5869 intptr_t retval, stack_top;
5870 retval = thr_stksegment(&st);
5871 assert(retval == 0, "incorrect return value from thr_stksegment");
5872 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5873 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5874 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5875 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5876 }
5877 }
5878
5879 // Just to get the Kernel build to link on solaris for testing.
5880
5881 extern "C" {
5882 class ASGCT_CallTrace;
5883 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5884 KERNEL_RETURN;
5885 }
5886
5887
5888 // ObjectMonitor park-unpark infrastructure ...
5889 //
5890 // We implement Solaris and Linux PlatformEvents with the
5891 // obvious condvar-mutex-flag triple.
5892 // Another alternative that works quite well is pipes:
5893 // Each PlatformEvent consists of a pipe-pair.
5894 // The thread associated with the PlatformEvent
5895 // calls park(), which reads from the input end of the pipe.
5896 // Unpark() writes into the other end of the pipe.
5897 // The write-side of the pipe must be set NDELAY.
5898 // Unfortunately pipes consume a large # of handles.
5899 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5900 // Using pipes for the 1st few threads might be workable, however.
5901 //
5902 // park() is permitted to return spuriously.
5903 // Callers of park() should wrap the call to park() in
5904 // an appropriate loop. A litmus test for the correct
5905 // usage of park is the following: if park() were modified
5906 // to immediately return 0 your code should still work,
5907 // albeit degenerating to a spin loop.
|
5859 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5860 // libraries and should thus be removed. We will leave it behind for a while
5861 // until we no longer want to able to run on top of 1.3.0 Solaris production
5862 // JDK. See 4341971.
5863
5864 #define STACK_SLACK 0x800
5865
5866 extern "C" {
5867 intptr_t sysThreadAvailableStackWithSlack() {
5868 stack_t st;
5869 intptr_t retval, stack_top;
5870 retval = thr_stksegment(&st);
5871 assert(retval == 0, "incorrect return value from thr_stksegment");
5872 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5873 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5874 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5875 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5876 }
5877 }
5878
5879 // ObjectMonitor park-unpark infrastructure ...
5880 //
5881 // We implement Solaris and Linux PlatformEvents with the
5882 // obvious condvar-mutex-flag triple.
5883 // Another alternative that works quite well is pipes:
5884 // Each PlatformEvent consists of a pipe-pair.
5885 // The thread associated with the PlatformEvent
5886 // calls park(), which reads from the input end of the pipe.
5887 // Unpark() writes into the other end of the pipe.
5888 // The write-side of the pipe must be set NDELAY.
5889 // Unfortunately pipes consume a large # of handles.
5890 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5891 // Using pipes for the 1st few threads might be workable, however.
5892 //
5893 // park() is permitted to return spuriously.
5894 // Callers of park() should wrap the call to park() in
5895 // an appropriate loop. A litmus test for the correct
5896 // usage of park is the following: if park() were modified
5897 // to immediately return 0 your code should still work,
5898 // albeit degenerating to a spin loop.
|