Adding cplusplus ifdefs for C linkage in header files

src/core/lib/support/arena.h

@@ -27,6 +27,10 @@
 
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct gpr_arena gpr_arena;
 
 // Create an arena, with \a initial_size bytes in the first allocated buffer
@@ -36,4 +40,8 @@ void *gpr_arena_alloc(gpr_arena *arena, size_t size);
 // Destroy an arena, returning the total number of bytes allocated
 size_t gpr_arena_destroy(gpr_arena *arena);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_ARENA_H */

src/core/lib/support/backoff.h

@@ -21,6 +21,10 @@
 
 #include <grpc/support/time.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
   /// const:  how long to wait after the first failure before retrying
   int64_t initial_connect_timeout;
@@ -53,4 +57,8 @@ gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now);
 /// instead
 void gpr_backoff_reset(gpr_backoff *backoff);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_BACKOFF_H */

src/core/lib/support/mpscq.h

@@ -23,6 +23,10 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // Multiple-producer single-consumer lock free queue, based upon the
 // implementation from Dmitry Vyukov here:
 // http://www.1024cores.net/home/lock-free-algorithms/queues/intrusive-mpsc-node-based-queue
@@ -50,4 +54,8 @@ gpr_mpscq_node *gpr_mpscq_pop(gpr_mpscq *q);
 // Pop a node; sets *empty to true if the queue is empty, or false if it is not
 gpr_mpscq_node *gpr_mpscq_pop_and_check_end(gpr_mpscq *q, bool *empty);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_MPSCQ_H */

src/core/lib/support/murmur_hash.h

@@ -23,7 +23,15 @@
 
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* compute the hash of key (length len) */
 uint32_t gpr_murmur_hash3(const void *key, size_t len, uint32_t seed);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_MURMUR_HASH_H */

src/core/lib/support/stack_lockfree.h

@@ -21,6 +21,10 @@
 
 #include <stddef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct gpr_stack_lockfree gpr_stack_lockfree;
 
 /* This stack must specify the maximum number of entries to track.
@@ -35,4 +39,8 @@ int gpr_stack_lockfree_push(gpr_stack_lockfree *, int entry);
 /* Returns -1 on empty or the actual entry number */
 int gpr_stack_lockfree_pop(gpr_stack_lockfree *stack);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_STACK_LOCKFREE_H */

src/core/lib/support/string_windows.h

@@ -21,6 +21,10 @@
 
 #include <grpc/support/port_platform.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifdef GPR_WINDOWS
 
 /* These allocate new strings using gpr_malloc to convert from and to utf-8. */
@@ -29,4 +33,8 @@ LPSTR gpr_tchar_to_char(LPCTSTR input);
 
 #endif /* GPR_WINDOWS */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_STRING_WINDOWS_H */

src/core/lib/support/time_precise.h

@@ -21,7 +21,15 @@
 
 #include <grpc/support/time.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void gpr_precise_clock_init(void);
 void gpr_precise_clock_now(gpr_timespec *clk);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GRPC_CORE_LIB_SUPPORT_TIME_PRECISE_H */