From be9a7f8d052b997d9bea384a69508081d48ade63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nerijus=20Bali=C5=ABnas?= <nerijus@users.sourceforge.net>
Date: Sat, 4 May 2024 01:02:05 +0300
Subject: [PATCH 1/4] Fix undefined reference to 'gettid' on CentOS 8

---
 src/vabackend.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/vabackend.h b/src/vabackend.h
index 4b590cb..fb049b2 100644
--- a/src/vabackend.h
+++ b/src/vabackend.h
@@ -13,6 +13,13 @@
 #include "direct/nv-driver.h"
 #include "common.h"
 
+#include <unistd.h>
+#include <sys/syscall.h>
+#ifndef SYS_gettid
+#error "SYS_gettid unavailable on this system"
+#endif
+#define gettid() ((pid_t)syscall(SYS_gettid))
+
 #define SURFACE_QUEUE_SIZE 16
 #define MAX_IMAGE_COUNT 64
 

From 1478ac801b8a4015c472b88cdc40cb29be6a1711 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nerijus=20Bali=C5=ABnas?= <nerijus@users.sourceforge.net>
Date: Sat, 4 May 2024 01:58:53 +0300
Subject: [PATCH 2/4] Revert "Fix undefined reference to 'gettid' on CentOS 8"

This reverts commit be9a7f8d052b997d9bea384a69508081d48ade63.
---
 src/vabackend.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/src/vabackend.h b/src/vabackend.h
index fb049b2..4b590cb 100644
--- a/src/vabackend.h
+++ b/src/vabackend.h
@@ -13,13 +13,6 @@
 #include "direct/nv-driver.h"
 #include "common.h"
 
-#include <unistd.h>
-#include <sys/syscall.h>
-#ifndef SYS_gettid
-#error "SYS_gettid unavailable on this system"
-#endif
-#define gettid() ((pid_t)syscall(SYS_gettid))
-
 #define SURFACE_QUEUE_SIZE 16
 #define MAX_IMAGE_COUNT 64
 

From a9f1aee050c576ce3e8f9d801c721f02347fb350 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nerijus=20Bali=C5=ABnas?= <nerijus@users.sourceforge.net>
Date: Sat, 4 May 2024 16:05:27 +0300
Subject: [PATCH 3/4] Fix undefined reference to 'gettid' on CentOS 8

---
 src/vabackend.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/vabackend.c b/src/vabackend.c
index b803441..aaf529f 100644
--- a/src/vabackend.c
+++ b/src/vabackend.c
@@ -36,8 +36,34 @@
 #if __has_include(<pthread_np.h>)
 #include <pthread_np.h>
 #define gettid pthread_getthreadid_np
+#define HAVE_GETTID 1
 #endif
 
+#ifndef HAVE_GETTID
+#include <sys/syscall.h>
+#include <unistd.h>
+/* Bionic and glibc >= 2.30 declare gettid() system call wrapper in unistd.h and
+ * has a definition for it */
+#ifdef __BIONIC__
+#define HAVE_GETTID 1
+#elif !defined(__GLIBC_PREREQ)
+#define HAVE_GETTID 0
+#elif !__GLIBC_PREREQ(2,30)
+#define HAVE_GETTID 0
+#else
+#define HAVE_GETTID 1
+#endif
+#endif
+
+static pid_t nv_gettid(void)
+{
+#if HAVE_GETTID
+    return gettid();
+#else
+    return syscall(__NR_gettid);
+#endif
+}
+
 static pthread_mutex_t concurrency_mutex = PTHREAD_MUTEX_INITIALIZER;
 static uint32_t instances;
 static uint32_t max_instances;
@@ -176,7 +202,7 @@ void logger(const char *filename, const char *function, int line, const char *ms
     struct timespec tp;
     clock_gettime(CLOCK_MONOTONIC, &tp);
 
-    fprintf(LOG_OUTPUT, "%10ld.%09ld [%d-%d] %s:%4d %24s %s\n", (long)tp.tv_sec, tp.tv_nsec, getpid(), gettid(), filename, line, function, formattedMessage);
+    fprintf(LOG_OUTPUT, "%10ld.%09ld [%d-%d] %s:%4d %24s %s\n", (long)tp.tv_sec, tp.tv_nsec, getpid(), nv_gettid(), filename, line, function, formattedMessage);
     fflush(LOG_OUTPUT);
 }
 

From 66d16932ab692a7369fed009f1c64bb12f4f54a5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nerijus=20Bali=C5=ABnas?= <nerijus@users.sourceforge.net>
Date: Sat, 4 May 2024 16:14:46 +0300
Subject: [PATCH 4/4] Remove duplicated include

---
 src/vabackend.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/vabackend.c b/src/vabackend.c
index aaf529f..8b50e1b 100644
--- a/src/vabackend.c
+++ b/src/vabackend.c
@@ -41,7 +41,6 @@
 
 #ifndef HAVE_GETTID
 #include <sys/syscall.h>
-#include <unistd.h>
 /* Bionic and glibc >= 2.30 declare gettid() system call wrapper in unistd.h and
  * has a definition for it */
 #ifdef __BIONIC__