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From https://github.com/grpc/grpc/commit/57586a1ca7f17b1916aed3dea4ff8de872dbf853
From: Benjamin Peterson <benjamin@dropbox.com>
Date: Fri, 3 May 2019 08:11:00 -0700
Subject: [PATCH] Rename gettid() functions.

glibc 2.30 will declare its own gettid; see https://sourceware.org/git/?p=glibc.git;a=commit;h=1d0fc213824eaa2a8f8c4385daaa698ee8fb7c92. Rename the grpc versions to avoid naming conflicts.
---
 src/core/lib/gpr/log_linux.cc          | 6 ++----
 src/core/lib/gpr/log_posix.cc          | 4 ++--
 src/core/lib/iomgr/ev_epollex_linux.cc | 4 ++--
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/third_party/grpc/src/core/lib/gpr/log_linux.cc b/src/core/lib/gpr/log_linux.cc
index 81026e5689b..8b597b4cf2f 100644
--- a/third_party/grpc/src/core/lib/gpr/log_linux.cc
+++ b/third_party/grpc/src/core/lib/gpr/log_linux.cc
@@ -40,7 +40,7 @@
 #include <time.h>
 #include <unistd.h>

-static long gettid(void) { return syscall(__NR_gettid); }
+static long sys_gettid(void) { return syscall(__NR_gettid); }

 void gpr_log(const char* file, int line, gpr_log_severity severity,
              const char* format, ...) {
@@ -70,7 +70,7 @@ void gpr_default_log(gpr_log_func_args* args) {
   gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
   struct tm tm;
   static __thread long tid = 0;
-  if (tid == 0) tid = gettid();
+  if (tid == 0) tid = sys_gettid();

   timer = static_cast<time_t>(now.tv_sec);
   final_slash = strrchr(args->file, '/');
diff --git a/third_party/grpc/src/core/lib/gpr/log_posix.cc b/src/core/lib/gpr/log_posix.cc
index b6edc14ab6b..2f7c6ce3760 100644
--- a/third_party/grpc/src/core/lib/gpr/log_posix.cc
+++ b/third_party/grpc/src/core/lib/gpr/log_posix.cc
@@ -31,7 +31,7 @@
 #include <string.h>
 #include <time.h>

-static intptr_t gettid(void) { return (intptr_t)pthread_self(); }
+static intptr_t sys_gettid(void) { return (intptr_t)pthread_self(); }

 void gpr_log(const char* file, int line, gpr_log_severity severity,
              const char* format, ...) {
@@ -86,7 +86,7 @@ void gpr_default_log(gpr_log_func_args* args) {
   char* prefix;
   gpr_asprintf(&prefix, "%s%s.%09d %7" PRIdPTR " %s:%d]",
                gpr_log_severity_string(args->severity), time_buffer,
-               (int)(now.tv_nsec), gettid(), display_file, args->line);
+               (int)(now.tv_nsec), sys_gettid(), display_file, args->line);

   fprintf(stderr, "%-70s %s\n", prefix, args->message);
   gpr_free(prefix);
diff --git a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
index c2d80c08ddb..4a83cb6c215 100644
--- a/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
+++ b/third_party/grpc/src/core/lib/iomgr/ev_epollex_linux.cc
@@ -1077,7 +1077,7 @@ static void end_worker(grpc_pollset* pollset, grpc_pollset_worker* worker,
 }

 #ifndef NDEBUG
-static long gettid(void) { return syscall(__NR_gettid); }
+static long sys_gettid(void) { return syscall(__NR_gettid); }
 #endif

 /* pollset->mu lock must be held by the caller before calling this.
@@ -1097,7 +1097,7 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
 #define WORKER_PTR (&worker)
 #endif
 #ifndef NDEBUG
-  WORKER_PTR->originator = gettid();
+  WORKER_PTR->originator = sys_gettid();
 #endif
   if (GRPC_TRACE_FLAG_ENABLED(grpc_polling_trace)) {
     gpr_log(GPR_INFO,