From ede7dbb3ef4b668a4476a54aab84b60d1d852a71 Mon Sep 17 00:00:00 2001
From: David CARLIER <devnexen@gmail.com>
Date: Tue, 29 Mar 2022 13:58:00 +0100
Subject: [PATCH] Following up using writev/fsync direct syscalls to avoid
 pthread interpositions (#499)

As these calls carries a pthread cancellation check and due to pthread allocation
 libc init timing, we directly access their syscalls instead.
---
 src/pal/pal_netbsd.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/pal/pal_netbsd.h b/src/pal/pal_netbsd.h
index 377c1cc..7539470 100644
--- a/src/pal/pal_netbsd.h
+++ b/src/pal/pal_netbsd.h
@@ -5,6 +5,16 @@
 
 #  include <fcntl.h>
 
+/**
+ * We skip the pthread cancellation checkpoints by reaching directly
+ * the following syscalls so we avoid the possible pthread
+ * allocation initialization timing issues.
+ * @{
+ */
+extern "C" ssize_t _sys_writev(int fd, const struct iovec* iov, int iovcnt);
+extern "C" int _sys_fsync(int fd);
+/// @}
+
 namespace snmalloc
 {
   /**
@@ -13,7 +23,7 @@ namespace snmalloc
    * This adds NetBSD-specific aligned allocation to the generic BSD
    * implementation.
    */
-  class PALNetBSD : public PALBSD_Aligned<PALNetBSD>
+  class PALNetBSD : public PALBSD_Aligned<PALNetBSD, _sys_writev, _sys_fsync>
   {
   public:
     /**