$NetBSD: patch-aa,v 1.10 2021/06/28 15:53:57 tnn Exp $

-DragonFly support.
-Add workaround for missing  sem_timedwait() in NetBSD < 6.99.4

--- hotspot/src/os/bsd/vm/os_bsd.cpp.orig	2021-05-14 21:52:06.000000000 +0000
+++ hotspot/src/os/bsd/vm/os_bsd.cpp
@@ -110,7 +110,7 @@
 # include <vm/vm_param.h>
 #endif
 
-#if defined(__FreeBSD__) || defined(__NetBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 # include <elf.h>
 #endif
 
@@ -296,6 +296,7 @@ void os::Bsd::initialize_system_info() {
   size_t len;
   int cpu_val;
   julong mem_val;
+  struct rlimit limits;
 
   /* get processors count via hw.ncpus sysctl */
   mib[0] = CTL_HW;
@@ -334,14 +335,11 @@ void os::Bsd::initialize_system_info() {
        _physical_memory = 256*1024*1024;       // fallback (XXXBSD?)
   }
 
-#ifdef __OpenBSD__
-  {
-       // limit _physical_memory memory view on OpenBSD since
-       // datasize rlimit restricts us anyway.
-       struct rlimit limits;
-       getrlimit(RLIMIT_DATA, &limits);
-       _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
-  }
+  getrlimit(RLIMIT_DATA, &limits);
+  _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
+#if defined(RLIMIT_AS)
+  getrlimit(RLIMIT_AS, &limits);
+  _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
 #endif
 }
 
@@ -393,7 +391,7 @@ void os::init_system_properties_values()
 //        ...
 //        7: The default directories, normally /lib and /usr/lib.
 #ifndef DEFAULT_LIBPATH
-#define DEFAULT_LIBPATH "/lib:/usr/lib"
+#define DEFAULT_LIBPATH "@PREFIX@/lib/jni:@PREFIX@/lib:/lib:/usr/lib"
 #endif
 
 // Base path of extensions installed on the system.
@@ -1605,8 +1603,15 @@ void * os::dll_load(const char *filename
     {EM_PPC,         EM_PPC,     ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
     {EM_PPC64,       EM_PPC64,   ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
     {EM_ARM,         EM_ARM,     ELFCLASS32,   ELFDATA2LSB, (char*)"ARM"},
+#if defined(EM_AARCH64)
+    {EM_AARCH64,     EM_AARCH64, ELFCLASS64,   ELFDATA2LSB, (char*)"Aarch64"},
+#endif
+#if defined(EM_S390)
     {EM_S390,        EM_S390,    ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
+#endif
+#if defined(EM_ALPHA)
     {EM_ALPHA,       EM_ALPHA,   ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
+#endif
     {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
     {EM_MIPS,        EM_MIPS,    ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
     {EM_PARISC,      EM_PARISC,  ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
@@ -2108,11 +2113,15 @@ class Semaphore : public StackObj {
 };
 
 Semaphore::Semaphore() {
+  _semaphore = NULL;
   SEM_INIT(_semaphore, 0);
 }
 
 Semaphore::~Semaphore() {
-  SEM_DESTROY(_semaphore);
+  if (_semaphore != NULL) {
+    SEM_DESTROY(_semaphore);
+    _semaphore = NULL;
+  }
 }
 
 void Semaphore::signal() {
@@ -2166,6 +2175,33 @@ bool Semaphore::timedwait(unsigned int s
 
 #else
 
+#if defined(__NetBSD__) && (__NetBSD_Version__ < 699000400)
+static inline int sem_timedwait(sem_t *sem, struct timespec *ts) {
+  struct timespec onems = { 0, 1000000 };
+  struct timespec total = { 0, 0 };
+  struct timespec unslept;
+  struct timespec elapsed;
+  struct timespec tmp;
+
+  while (timespeccmp(ts, &total, >)) {
+    if (sem_trywait(sem) == 0)
+      return 0;
+
+    if (errno != EAGAIN)
+      return -1;
+
+    (void)nanosleep(&onems, &unslept);
+
+    timespecsub(&onems, &unslept, &elapsed);
+    timespecadd(&total, &elapsed, &tmp);
+    total.tv_sec = tmp.tv_sec;
+    total.tv_nsec = tmp.tv_nsec;
+  }
+  errno = ETIMEDOUT;
+  return -1;
+}
+#endif /* __NetBSD__ */
+
 bool Semaphore::trywait() {
   return sem_trywait(&_semaphore) == 0;
 }
@@ -2316,7 +2352,7 @@ static void warn_fail_commit_memory(char
 //       problem.
 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
   int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
-#ifdef __OpenBSD__
+#if defined(__OpenBSD__) || defined(__NetBSD__)
   // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
   if (::mprotect(addr, size, prot) == 0) {
     return true;
@@ -3017,7 +3053,7 @@ OSReturn os::set_native_priority(Thread*
 #ifdef __OpenBSD__
   // OpenBSD pthread_setprio starves low priority threads
   return OS_OK;
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
   int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
   return (ret == 0) ? OS_OK : OS_ERR;
 #elif defined(__APPLE__) || defined(__NetBSD__)
@@ -3046,7 +3082,7 @@ OSReturn os::get_native_priority(const T
   }
 
   errno = 0;
-#if defined(__OpenBSD__) || defined(__FreeBSD__)
+#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
   *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
 #elif defined(__APPLE__) || defined(__NetBSD__)
   int policy;
@@ -3733,7 +3769,11 @@ void os::Bsd::check_signal_handler(int s
   struct sigaction act;
   if (os_sigaction == NULL) {
     // only trust the default sigaction, in case it has been interposed
+#if defined(__NetBSD__)
+    os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "__sigaction14");
+#else
     os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
+#endif
     if (os_sigaction == NULL) return;
   }
 
@@ -4065,7 +4105,7 @@ void os::set_native_thread_name(const ch
 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
     pthread_set_name_np(pthread_self(), name);
 #elif defined(__NetBSD__)
-    pthread_setname_np(pthread_self(), "%s", name);
+    pthread_setname_np(pthread_self(), "%s", (void*)name);
 #endif
   }
 }