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From 5d03f3ca8ddc7313de59e54d83912b1f3c049170 Mon Sep 17 00:00:00 2001
From: "Todd Foggoa (tfoggoa)" <tfoggoa@cisco.com>
Date: Wed, 3 Feb 2016 08:35:27 -0800
Subject: [PATCH 7/8] Allow applications to override rte_delay_us()
Some applications may wish to define their own implentation of
usec delay other than the existing blocking one. The default
behavior remains unchanged.
Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
---
lib/librte_eal/common/eal_common_timer.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/lib/librte_eal/common/eal_common_timer.c b/lib/librte_eal/common/eal_common_timer.c
index 72371b8..5189fa5 100644
--- a/lib/librte_eal/common/eal_common_timer.c
+++ b/lib/librte_eal/common/eal_common_timer.c
@@ -47,9 +47,21 @@
/* The frequency of the RDTSC timer resolution */
static uint64_t eal_tsc_resolution_hz;
+/* Allow an override of the rte_delay_us function */
+int rte_delay_us_override (unsigned us) __attribute__((weak));
+
+int
+rte_delay_us_override(__attribute__((unused)) unsigned us)
+{
+ return 0;
+}
+
void
rte_delay_us(unsigned us)
{
+ if (rte_delay_us_override(us))
+ return;
+
const uint64_t start = rte_get_timer_cycles();
const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
while ((rte_get_timer_cycles() - start) < ticks)
--
2.2.1
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