first commit

.gitignore

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+/async/async
+/readspeed/readspeed
+*.o

async/Makefile

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+CC=    tcc
+all: async
+clean:
+	rm async

async/async.c

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+/*****
+ *
+ * Print start and end
+ * time after sleeping
+ * a random interval
+ *
+ *****/
+
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<stdint.h>
+#include<string.h>
+
+#define id (name)?(name):(argv[1])
+
+char*tmstr(time_t t)
+{
+	struct tm*ptm=localtime(&t);
+	char buffer[32]={0};
+	strftime(buffer,32,"%H:%M:%S",ptm);
+	return buffer;
+}
+
+int main(int argc,char**argv)
+{
+	time_t spawn=time(NULL);
+	time_t now=0;
+	char spawn_str[32]={0};
+	char now_str[32]={0};
+	uint32_t seed=0;
+	char*name=NULL;
+
+	if(argc<2)return 1;
+	if(argc>2)name=argv[2];
+
+	for(size_t i=0;argv[1][i];++i)
+		seed+=argv[1][i];
+
+	strcpy(spawn_str,tmstr(spawn));
+
+	//printf("[%s]:seed:%lu\n",argv[1],seed);
+
+	srand(seed);
+	sleep(rand()%5);
+	now=time(NULL);
+	strcpy(now_str,tmstr(now));
+
+	printf("[%s] %s %s\n",id,spawn_str,now_str);
+	//printf("spawn:%lu, now:%lu\n",spawn,now);
+}

async/run

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+#!/bin/sh
+
+main()
+{
+	[ -e ./async ] || make || return 1
+	for x in $(seq 1 5); do
+		./async "$(dd if=/dev/urandom of=/dev/stdout bs=1 count=8 status=none)" $x &
+	done
+}
+
+main $*

readspeed/Makefile

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+CC=    tcc
+all: readspeed
+clean:
+	rm readspeed foo

readspeed/readspeed.c

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+/*****
+ *
+ * Test time of reading
+ * file into buffer with
+ * different block sizes
+ *
+ *****/
+
+#include<fcntl.h>
+#include<stdint.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<time.h>
+#include<unistd.h>
+
+void bufferread(const int fd,const size_t bs)
+{
+	uint8_t buffer[bs];
+
+	if(fd<=2)
+	{
+		printf("error: file descriptor cannot be 0, 1, or 2\n");
+		return;
+	}
+	if(bs<1)
+	{
+		printf("error: bs cannot be zero\n");
+		return;
+	}
+
+	while(read(fd,buffer,bs)>0)
+	{
+	}
+}
+
+int main(const int argc,const char*argv[])
+{
+
+	if(argc<2)
+	{
+		printf("error: input file not specified\n");
+		return 1;
+	}
+
+	if(argc<3)
+	{
+		printf("error: bs not specified\n");
+		return 1;
+	}
+
+	const size_t bs=atoi(argv[2]);
+
+	if(bs==0)
+	{
+		printf("error: invalid bs\n");
+		return 1;
+	}
+
+	//printf("bs: %lu\n",bs);
+
+	const char*const infilename=argv[1];
+
+	const int infilefd=open(infilename,O_RDONLY);
+
+	if(infilefd<0)
+	{
+		printf("error: failed to open file '%s'\n",infilename);
+		return 1;
+	}
+
+	bufferread(infilefd,bs);
+
+}

readspeed/run

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+#!/bin/sh
+
+main()
+{
+	local FILENAME=foo
+	i=1
+	[ -e ./readspeed ] || make || return 1
+	[ -e ./foo ] || dd if=/dev/zero of=foo bs=1M count=100 status=none
+	for x in 32 64 128 256 512 1024; do
+		time -qf '%C %E' ./readspeed $FILENAME $x "[$i]" &
+		let i++
+	done
+}
+
+main $*