From 29bbd99b0e0dc1f45c815dbd29d015a8ace50808 Mon Sep 17 00:00:00 2001
From: Maurus Erni <maurus.erni@geocom.ch>
Date: Tue, 25 Apr 2017 13:50:01 +0200
Subject: [PATCH] Adding flag to disable alerts (polling of GPIOs)

---
 pigpio.c  | 9 ++++++---
 pigpio.h  | 1 +
 pigpiod.c | 4 ++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/pigpio.c b/pigpio.c
index 8310e31..fac0daa 100644
--- a/pigpio.c
+++ b/pigpio.c
@@ -8115,10 +8115,13 @@ int initInitialise(void)
    if (pthread_attr_setstacksize(&pthAttr, STACK_SIZE))
       SOFT_ERROR(PI_INIT_FAILED, "pthread_attr_setstacksize failed (%m)");
 
-   if (pthread_create(&pthAlert, &pthAttr, pthAlertThread, &i))
-      SOFT_ERROR(PI_INIT_FAILED, "pthread_create alert failed (%m)");
+   if (!(gpioCfg.ifFlags & PI_DISABLE_ALERT))
+   {
+      if (pthread_create(&pthAlert, &pthAttr, pthAlertThread, &i))
+         SOFT_ERROR(PI_INIT_FAILED, "pthread_create alert failed (%m)");
 
-   pthAlertRunning = 1;
+      pthAlertRunning = 1;
+   }
 
    if (!(gpioCfg.ifFlags & PI_DISABLE_FIFO_IF))
    {
diff --git a/pigpio.h b/pigpio.h
index 192006a..cb1d76d 100644
--- a/pigpio.h
+++ b/pigpio.h
@@ -846,6 +846,7 @@ typedef void *(gpioThreadFunc_t) (void *);
 #define PI_DISABLE_FIFO_IF   1
 #define PI_DISABLE_SOCK_IF   2
 #define PI_LOCALHOST_SOCK_IF 4
+#define PI_DISABLE_ALERT     8
 
 /* memAllocMode */
 
diff --git a/pigpiod.c b/pigpiod.c
index 989cf07..8323380 100644
--- a/pigpiod.c
+++ b/pigpiod.c
@@ -217,6 +217,10 @@ static void initOpts(int argc, char *argv[])
             ifFlags |= PI_LOCALHOST_SOCK_IF;
             break; 
 
+         case 'm':
+            ifFlags |= PI_DISABLE_ALERT;
+            break; 
+
          case 'n':
             addr = checkAddr(optarg);
             if (addr && (numSockNetAddr<MAX_CONNECT_ADDRESSES))