sw: Thread-safe putchar() function

pulp-platform · Jul 19, 2024 · d0c0e2f · d0c0e2f
1 parent 8d9229d
commit d0c0e2f
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/target/snitch_cluster/sw/runtime/rtl/src/putchar.c b/target/snitch_cluster/sw/runtime/rtl/src/putchar.c
@@ -51,10 +51,12 @@ void _putchar(char character) {
         buf->hdr.syscall_mem[2] = (uintptr_t)&buf->data;  // buffer
         buf->hdr.syscall_mem[3] = buf->hdr.size;          // length
 
+        snrt_mutex_acquire(snrt_mutex());
         tohost = (uintptr_t)buf->hdr.syscall_mem;
         while (fromhost == 0)
             ;
         fromhost = 0;
+        snrt_mutex_release(snrt_mutex());
 
         buf->hdr.size = 0;
     }