Fix lock assertion violation in GC_find_limit if always multi-threaded

Issue #399 (bdwgc).

* misc.c [GC_ASSERTIONS && GC_ALWAYS_MULTITHREADED
&& (SEARCH_FOR_DATA_START || NETBSD)] (GC_init): Wrap
GC_init_linux_data_start() and GC_init_netbsd_elf() calls into
LOCK/UNLOCK.

1 files changed, 8 insertions, 0 deletions

diff --git a/misc.c b/misc.c
index 7cf3d13c..49165eeb 100644
--- a/misc.c
+++ b/misc.c
@@ -1186,12 +1186,20 @@ GC_API void GC_CALL GC_init(void)
         /* entirety as part of the root set.  This will grow them to    */
         /* maximum size, and is generally not desirable.                */
 #   endif
+#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED) \
+       && (defined(SEARCH_FOR_DATA_START) || defined(NETBSD))
+        LOCK(); /* just to set GC_lock_holder */
+#   endif
 #   if defined(SEARCH_FOR_DATA_START)
         GC_init_linux_data_start();
 #   endif
 #   if defined(NETBSD) && defined(__ELF__)
         GC_init_netbsd_elf();
 #   endif
+#   if defined(GC_ASSERTIONS) && defined(GC_ALWAYS_MULTITHREADED) \
+       && (defined(SEARCH_FOR_DATA_START) || defined(NETBSD))
+        UNLOCK();
+#   endif
 #   if !defined(THREADS) || defined(GC_PTHREADS) \
         || defined(NN_PLATFORM_CTR) || defined(NINTENDO_SWITCH) \
         || defined(GC_WIN32_THREADS) || defined(GC_SOLARIS_THREADS)