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Implement atomic swar token bucket library

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Justine Tunney 2022-10-11 10:11:57 -07:00
parent c19ac8729d
commit e7329b7cba
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test/net/http/tokenbucket_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/atomic.h"
#include "libc/calls/struct/timespec.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/kprintf.h"
#include "libc/limits.h"
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
#include "net/http/http.h"
#include "net/http/tokenbucket.h"
#define TB_CIDR 22
#define TB_BYTES (1u << TB_CIDR)
#define TB_WORDS (TB_BYTES / 8)
union TokenBucket {
atomic_schar *b;
atomic_uint_fast64_t *w;
} tok;
void SetUp(void) {
ASSERT_NE(NULL, (tok.b = calloc(TB_BYTES, 1)));
}
void TearDown(void) {
free(tok.b);
}
TEST(tokenbucket, test) {
ASSERT_FALSE(AcquireToken(tok.b, 0x7f000001, TB_CIDR));
ASSERT_FALSE(AcquireToken(tok.b, 0x7f000002, TB_CIDR));
ReplenishTokens(tok.w, TB_WORDS);
ReplenishTokens(tok.w, TB_WORDS);
ASSERT_TRUE(AcquireToken(tok.b, 0x7f000001, TB_CIDR));
ASSERT_TRUE(AcquireToken(tok.b, 0x7f000002, TB_CIDR));
ASSERT_FALSE(AcquireToken(tok.b, 0x7f000001, TB_CIDR));
ASSERT_TRUE(AcquireToken(tok.b, 0x08080808, TB_CIDR));
ReplenishTokens(tok.w, TB_WORDS);
ReplenishTokens(tok.w, TB_WORDS);
ASSERT_TRUE(AcquireToken(tok.b, 0x7f000001, TB_CIDR));
ASSERT_TRUE(AcquireToken(tok.b, 0x7f000001, TB_CIDR));
ASSERT_FALSE(AcquireToken(tok.b, 0x7f000002, TB_CIDR));
ASSERT_TRUE(AcquireToken(tok.b, 0x08080808, TB_CIDR));
}
BENCH(tokenbucket, bench) {
struct timespec t1, t2;
clock_gettime(0, &t1);
ReplenishTokens(tok.w, TB_WORDS);
clock_gettime(0, &t2);
kprintf("token bucket replenish took %'ld us\n",
_timespec_tomicros(_timespec_sub(t2, t1)));
}