78b65086b9e1bcb23863206afb4d709d7dde5181

checking for input from GDB.  Discussed in #489.

diff --git a/simavr/sim/sim_gdb.c b/simavr/sim/sim_gdb.c
index ec950e6984ed4f9f3a8e6c41ba973ab848e050fa..cd2196ea5c7f673438df47014a46c6ff3de3c2cd 100644 (file)
--- a/simavr/sim/sim_gdb.c
+++ b/simavr/sim/sim_gdb.c
@@ -47,12 +47,17 @@ typedef struct {
        } points[WATCH_LIMIT];
 } avr_gdb_watchpoints_t;
 
+/* How many AVR instructions to execute before looking for gdb input. */
+
+#define GDB_BURST 256
+
 typedef struct avr_gdb_t {
        avr_t * avr;
-       int     listen; // listen socket
-       int     s;      // current gdb connection
+       int burst_count;        // Current instruction burst size
+       int     listen;                 // listen socket
+       int     s;                              // current gdb connection
 
-       avr_gdb_watchpoints_t breakpoints;
+    avr_gdb_watchpoints_t breakpoints;
        avr_gdb_watchpoints_t watchpoints;
 
        // These are used by gdb's "info io_registers" command.
@@ -789,6 +794,7 @@ gdb_network_handler(
        int max;
        FD_ZERO(&read_set);
 
+       g->burst_count = 0; // Reset burst count
        if (g->s != -1) {
                FD_SET(g->s, &read_set);
                max = g->s + 1;
@@ -934,8 +940,12 @@ avr_gdb_processor(
        } else if (avr->state == cpu_StepDone) {
                gdb_send_quick_status(g, 0);
                avr->state = cpu_Stopped;
+       } else {
+               /* Look for gdb input every GDB_BURST instructions. */
+
+               if (sleep == 0 && g->burst_count++ < GDB_BURST)
+                       return 0;
        }
-       // this also sleeps for a bit
        return gdb_network_handler(g, sleep);
 }